Eye & contact lens (Eye Contact Lens)

Publisher: Contact Lens Association of Ophthalmologists, Lippincott, Williams & Wilkins

Journal description

Dedicated to the medical and surgical management of refractive disorders, Eye and Contact Lens: Science and Clinical Practice is published for ophthalmologists, optometrists, and other eye care specialists. Each quarterly issue provides original peer-reviewed articles and online dialogue on leading developments and practical clinical applications of contact lenses, refractive surgery, cornea, ocular surface disease, glaucoma, and related anterior segment subjects.

Current impact factor: 1.68

Impact Factor Rankings

2015 Impact Factor Available summer 2015
2013 / 2014 Impact Factor 1.679
2012 Impact Factor 1.461
2011 Impact Factor 1.252
2010 Impact Factor 1.022

Impact factor over time

Impact factor
Year

Additional details

5-year impact 0.00
Cited half-life 0.00
Immediacy index 0.00
Eigenfactor 0.00
Article influence 0.00
Website Eye and Contact Lens: Science and Clinical Practice website
Other titles Eye & contact lens (Online), Eye & contact lens, Eye and contact lens, Journal of the Contact Lens Association of Ophthalmologists
ISSN 1542-233X
OCLC 50854203
Material type Document, Periodical, Internet resource
Document type Internet Resource, Computer File, Journal / Magazine / Newspaper

Publisher details

Lippincott, Williams & Wilkins

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    • Set statement to accompany deposit
    • Must link to publisher version
    • NIH authors will have their accepted manuscripts transmitted to PubMed Central on their behalf after a 12 months embargo (see policy for details)
    • Wellcome Trust and HHMI authors will have their accepted manuscripts transmitted to PubMed Central on their behalf after a 6 months embargo (see policy for details)
    • Publisher last reviewed on 19/03/2015
  • Classification
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Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: Various materials have been placed in the corneal stroma to modify a spherical refractive error (usually hyperopic). As the surgical procedures evolved to simplify the insertion process so has the quality and biocompatibility of the implanted materials. Failures have been due to excessive inlay dimensions, bioincompatibility of the materials used, poor choice of test model, or combinations of the above. We present a thorough analysis of the history of the intracorneal inlay and the materials and techniques used up to and including the current materials and techniques available for the correction of spherical refractive errors.
    Eye & contact lens 07/2015; 41(4):197-203. DOI:10.1097/ICL.0000000000000128
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    ABSTRACT: Pterygium is a fairly general condition in many regions of the world. The cause of this abnormality is still ambiguous. However, recent findings suggest that pterygium is a benign progressive tissue and not a degenerative disorder. The main goal of our study was to investigate the effects of P14 and MDM2 promoter methylation on the risk of pterygium. In this study, the DNA of 81 primary pterygium and 75 normal conjunctiva tissues was extracted and modified for the assessment of methylation of P14 and MDM2 promoters by methylation-specific polymerase chain reaction (MSP). We also estimated the mRNA expression levels of these genes in 23 pterygium and 18 normal conjunctiva tissue samples using real-time quantitative reverse transcriptase polymerase chain reaction. The frequency of methylation for P14 was 92.6% for cases and 97.3% for controls. MDM2 gene methylation at the promoter site was 39.5% and 72.0% for pterygium and normal conjunctiva tissues, respectively. So statistically, a significant relationship between MDM2 gene promoter methylation and the risk of disease was found (odds ratio=5.3; 95% confidence limit, 2.6-10.8; P<0.0001). In addition, the expression of MDM2 gene has increased in pterygium (1.371548±0.6727) in comparison with conjunctiva tissues as control (1.20621±1.0) (P<0.05), but it was not significant for P14 gene. Our results have indicated that hypomethyaltion and overexpression of MDM2 gene take place in patients with the pterygium. To confirm the presented data, suggesting further studies with a larger sample size in various genetic populations.
    Eye & contact lens 05/2015; DOI:10.1097/ICL.0000000000000126
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    ABSTRACT: To compare ease of adoption of the BostonSight Prosthetic Replacement of the Ocular Surface Ecosystem device, a custom-fit scleral lens, by patients in different age and diagnosis groups. In this prospective study, patients were categorized by age as younger than 60 or 60 years and older and by diagnosis as corneal irregularity (CI) or ocular surface disease (OSD). Ease of adoption of the scleral device was assessed by (1) number of devices and visits required to complete the fitting process, (2) time needed for device insertion and removal, (3) adaptation to the device, as assessed by daily wear time and by time needed to achieve full-time wear (defined as 8 hours per day), and (4) patients' subjective rating of ease of device insertion and removal. The length of the fitting process was also assessed. There was no significant difference in the number of devices and visits needed between age group younger than 60 and age group of 60 and older or between CI and OSD groups. Patients in all groups achieved full-time wear in less than 2 weeks. Average wear time per week did not differ significantly between age or diagnosis groups. Similarly, the time needed for daily insertion and removal during the fitting period, as well as patients' subjective rating of ease of device insertion and removal, did not differ between age or diagnosis categories. The length of the fitting process was significantly longer in the OSD group compared with the CI group (P<0.001); however, factors not related to ease of adoption of the scleral device may be responsible for this difference. Patients in both younger and older patient groups adopted the use of a scleral device with equal ease, as did patients in the CI and OSD diagnosis groups.
    Eye & contact lens 05/2015; DOI:10.1097/ICL.0000000000000151
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    ABSTRACT: To investigate the acute effects of topiramate on the anterior chamber angle (ACA) and choroidal thickness in patients with migraine. This prospective study included 15 eyes of 15 patients with migraine who have been scheduled to start topiramate therapy. All patients underwent complete ophthalmic examination including measurement of the ACA and choroidal thickness using a spectral domain optical coherence tomography device (Optovue Inc.) and refractive status evaluation with an autorefractokeratometer (KR-8100; Topcon) at the baseline and 1 week after starting therapy. The patients were asked to report any pain or discomfort in their eyes during therapy at the follow-up visit. None of the patients experienced pain or discomfort in their eyes. The mean ACA significantly decreased at the first week of the therapy compared with the baseline levels (40.34±7.06° and 36.89±6.87°, respectively) (P=0.001). However, the mean choroidal thickness increased from 277.33±95.60 μm at the baseline to 323.40±84.50 μm at the first week (P=0.01). There was a nonsignificant increase in the mean refractive error (from -0.25±0.54 diopter [D] at the baseline to -0.38±0.49 D after 1 week) (P=0.06). Topiramate can acutely decrease the ACA and increase the choroidal thickness. Because these effects may be asymptomatic, patients with migraine who start this therapy should be warned to be closely followed up by an ophthalmologist.
    Eye & contact lens 05/2015; DOI:10.1097/ICL.0000000000000157
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    ABSTRACT: The Boston type 1 keratoprosthesis (KPro) is the most commonly used artificial cornea worldwide. Long-term bandage contact lenses are the standard of care for patients with these devices. The goal of bandage contact lenses is to maintain hydration and to protect the corneal tissue that surrounds the anterior plate of the keratoprosthesis which is vulnerable to desiccation, epithelial breakdown, dellen formation, and corneal melt. Contact lenses can also improve comfort, correct refractive errors, and improve the cosmesis of patients with artificial corneas. However, the continuous use of contact lenses places these patients at risk for complications such as lens loss, lens deposits, chronic conjunctivitis, and infection. In addition, obtaining an adequate fit in a patient with a compromised ocular surface and history of multiple surgeries including glaucoma drainage devices can present a challenge. This review discusses the types of contact lenses used, special fitting considerations, and common complications in patients with previous KPro surgery.
    Eye & contact lens 05/2015; DOI:10.1097/ICL.0000000000000154
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    ABSTRACT: Xeroderma pigmentosum (XP) mainly affects the ocular surface; however, endothelial damage may also occur. We would like to report changes in the endothelial-Descemet layer and review the literature on similar findings in patients with XP, including the role of Descemet stripping automated endothelial keratoplasty (DSAEK) in the management of a 21-year-old man who presented with nonresolving corneal edema in the right eye after excision biopsy for conjunctival intraepithelial neoplasia. His best-corrected visual acuity (BCVA) was 20/200 in the right eye and 20/20 in the left eye. On general examination, there was patchy hyperpigmentation of the exposed areas of skin suggestive of XP. On examination of the right eye, there was stromal edema involving the exposed half of cornea. The left eye appeared normal. Pachymetry readings were 860 and 600 μm in the right and left eye, respectively. Descemet stripping automated endothelial keratoplasty was performed for endothelial dysfunction and the stripped endothelium, and Descemet membrane (DM) was sent for histopathologic evaluation. Postoperatively, the donor lenticule was well apposed and the overlying stromal edema resolved. The patient achieved a BCVA of 20/30 in the right eye without progression of corneal scarring at 1-year follow-up. In the meanwhile, however, the left eye developed corneal edema. Histopathology revealed gross attenuation of endothelial cells with uniform thickness of the DM. Corneal endothelial dysfunction in XP is amenable to treatment with DSAEK.
    Eye & contact lens 05/2015; DOI:10.1097/ICL.0000000000000161
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    ABSTRACT: To investigate the effectiveness of topical tacrolimus treatment on herpetic stromal keratitis (HSK) in a rat model. The development of HSK was monitored for 14 days after the inoculation of rats with herpes simplex type 1 virus. Rats that developed HSK were divided into four groups as follows: (1) topical antiviral treatment (control), (2) topical antiviral and 1% prednisolone acetate, (3) topical antiviral and 0.03% tacrolimus ointment, and (4) topical antiviral plus 0.1% tacrolimus ointment. After 14 days of treatment, the severity levels of HSK were scored and compared with the levels before the treatment. The expression of CD3, CD4, and CD8 was evaluated by flow cytometry. The development of the disease was evaluated clinically and histologically. Significant improvement in vascularization was observed in the groups with the drug treatment in addition to the antiviral agent (P<0.05), but there was no obvious difference within groups 2, 3, and 4 in the vascularization severity. The regression of corneal edema was 8.05%±6% in group 1, 25.17%±14.55% in group 2 (P=0.01), 36.40%±21.69% in group 3 (P=0.03), and 46.39%±14.96% in group 4 (P=0.00). A significant decrease in the number of inflammatory cells in the groups with the drug treatment was evaluated by immunohistochemical staining and confirmed by flow cytometry analysis. Topical tacrolimus treatment caused a significant decrease in corneal vascularization accompanied by a lower number of inflammatory cells in the experimental HSK corneal edema model. Therefore, topical tacrolimus has the potential to be used in the treatment of HSK.
    Eye & contact lens 05/2015; DOI:10.1097/ICL.0000000000000162
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    ABSTRACT: To compare tear meniscus measurements obtained by optical coherence tomography (OCT) and tear osmolarity with dry eye severity according to the Dry Eye Workshop (DEWS) classification system. Forty-four eyes of 22 patients with dry eye disease (DED) were recruited in this prospective study. In all eyes, ophthalmic examination was performed in the same order as follows: Ocular Surface Disease Index (OSDI) survey, tear film osmolarity measurement with TearLab Osmolarity System, tear meniscus measurements by OCT, corneal fluorescein staining scoring, conjunctival lissamine green staining scoring, tear film breakup time assessment, and anesthetized Schirmer test. Dry eye disease severity was graded according to the DEWS dry eye severity grading system, and the patients were divided into two groups. Group 1 composed of the patients with grades 1 and 2 DED, and group 2 composed of the patients with grades 3 and 4 DED. The mean tear osmolarity value was significantly higher in group 2 (318.9±12.8 mOsm/L) than in group 1 (308.1±8.5 mOsm/L) (P<0.01). The mean tear meniscus height (TMH), tear meniscus depth (TMD), and tear meniscus area (TMA) values were significantly lower in group 2 (172.9±73.5 μm, 121.57±46.2 μm, and 0.013±0.012 mm, respectively) than in group 1 (218.5±70.2 μm, 157.94±49.1 μm, and 0.022±0.013 mm, respectively) (P=0.05, P=0.02, and P=0.026, respectively). There was a negative correlation between TMH and OSDI at the level of 45% (r=-0.450; P<0.05), between TMD and OSDI at the level of 47% (r=-0.470, P<0.05), and lastly between TMA and OSDI at the level of 48.5% (r=-0.485, P<0.05). There was no correlation between OSDI and tear osmolarity (P>0.05). Both tear osmolarity and tear meniscus OCT measurements comply with the DEWS grading system, and they can be used in the diagnosis and follow-up of dry eye patients in addition to conventional tests.
    Eye & contact lens 05/2015; DOI:10.1097/ICL.0000000000000168
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    ABSTRACT: Anterior chamber intraocular lenses (ACIOL) have been known to be associated with several complications, including endophthalmitis. We present a patient who developed another type of severe complication: epithelial downgrowth associated with an extruded footplate of an ACIOL. Case report. A 70-year-old schizophrenic woman underwent implantation of an ACIOL during cataract extraction that was complicated by posterior capsular rupture, erratic patient movement, conversion to extracapsular cataract extraction (ECCE), and vitreous loss in her left eye. She subsequently presented with progressively decreasing vision, and she was found to have extensive epithelial downgrowth that also resulted in neovascularization of the iris and recurrent hyphemas. The patient elected to have the ACIOL explanted, and at the time of the surgery, it was noted that one of the footplates of the ACIOL was protruding through the original ECCE wound. We believe that the extrusion of this footplate was one contributing factor toward severe epithelial downgrowth. Although exposure of an ACIOL haptic is a very rare occurrence, it can have severe consequences, including epithelial downgrowth.
    Eye & contact lens 05/2015; DOI:10.1097/ICL.0000000000000165
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    ABSTRACT: To report the outcomes of viscoelastic-aided non-Descemet stripping automated endothelial keratoplasty (nDSAEK) to treat bullous keratopathy in vitrectomized and iris-lens diaphragm injured eyes. A prospective consecutive case series of eyes with bullous keratopathy underwent nDSAEK. About 0.15 to 0.2 mL cohesive viscoelastic was injected into the anterior chamber in front of the iris defect to prevent air from entering the posterior chamber and vitreous cavity. Filtered air was injected until the intraocular pressure (IOP) rose to a mildly high level. Graft position and complications were monitored postoperatively. Endothelial cell density and best-corrected visual acuity (BCVA) were recorded at a 1-year follow-up. Viscoelastic-aided nDSAEK was performed in 21 cases (11 males, 10 females; mean age: 58.9±12.4 years). No intraoperative complications were noted. Effective graft adherence was achieved in all cases intraoperatively. Postoperatively, partial graft dislocation was seen in 2 cases because of hypotony (IOP, 6 and 5 mm Hg, respectively) due to postoperative cyclodialysis as demonstrated on anterior segment optical coherence tomography. Hypotony was successfully managed conservatively with spontaneous graft reattachment. One year postoperatively, the median BCVA improved to 20/50. The mean endothelial cell loss was 14.7±12.6% and 20.5±11.1% at 6 months and 1 year, respectively. In vitrectomized and iris-lens diaphragm injured eyes, viscoelastic-aided nDSAEK effectively facilitated graft adherence and reduced graft dislocation. Appropriate control of IOP was considered to play a vital role in supporting the graft adherence.
    Eye & contact lens 05/2015; DOI:10.1097/ICL.0000000000000156
  • Eye & contact lens 05/2015; 41(4):252-254. DOI:10.1097/ICL.0000000000000160
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    ABSTRACT: To quantify short-term changes in corneal high-order aberrations (HOA) with piggyback contact lens use in an eye with keratoconus that had undergone intrastromal ring segment (Intacs) implantation. A patient with keratoconus reporting of distorted images after Intacs surgery was found to have HOA (trefoil, point spread function [PSF], and modulation transfer function [MTF]) as measured using wavefront technology (Nidek OPD-Scan III) and evidenced by her cylindrical correction. She underwent piggyback contact lens (silicone hydrogel and fluoroperm rigid gas-permeable lenses) fitting in an attempt to improve the HOA. After piggyback contact lens fitting, her visual acuity improved and all her visual symptoms resolved. High-order aberrations reduced from 3.152 to 0.490 after the lens fitting and was noted to be 0.447 at 6 months; trefoil also significantly improved (0.360-0.096; it was 0.031 at 6 months). The cylinder decreased from -4.50 to -0.75 and was stable at 6 months (-1.00). There was also significant improvement in PSF and MTF. Visual acuity and symptoms along with HOA and cylinder improved after fitting of piggyback contact lens in our patient with keratoconus who had undergone Intacs.
    Eye & contact lens 05/2015; DOI:10.1097/ICL.0000000000000159
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    ABSTRACT: To describe four cases of intraoperative suprachoroidal hemorrhage (SCH) during penetrating keratoplasty and to review the literature. Cases with intraoperative SCH during penetrating keratoplasty over 3-year period were reviewed. The parameters evaluated were ocular and systemic risk factors, intraoperative details, and postoperative outcomes. A review of literature of intraoperative SCH during penetrating keratoplasty was also conducted. Of the 543 cases that underwent penetrating keratoplasty for optical indications during the study period, four cases developed intraoperative SCH, which is an incidence of 0.73%. Suprachoroidal hemorrhage occurred in the following cases: failed pediatric graft, donor eye in a case of contralateral autokeratoplasty, Marfan syndrome with aphakic bullous keratopathy who had undergone multiple ocular surgeries, and a case of healed keratitis with corneoiridic scar. The mean age, axial length, and intraocular pressure were 32.75±22.17 years (range, 4-57 years), 23.29±2.12 mm (range, 20.38-25.2 mm), and 16.25±3.86 mm Hg (range, 16-20 mm Hg), respectively. Postoperatively, two eyes had a best-corrected visual acuity (BCVA) of counting fingers. The third case had BCVA of light perception (LP), and fourth eye had no LP. The visual outcomes in cases of open-sky penetrating keratoplasty with SCH continue to be abysmally poor. The importance of thoroughly informing the patient about this complication cannot be underrated.
    Eye & contact lens 05/2015; DOI:10.1097/ICL.0000000000000164
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    ABSTRACT: Subjective symptoms and other eye complications were assessed and retrospectively compared in patients belonging to a proprietary membership system who switched from 2-week frequent replacement (2WFR) wear to daily disposable (DD) lens use. Questionnaire responses were completed by all patients for a 5-year interval between October 2008 and September 2013 from 83 wearers in three Japanese clinics (59 female and 24 male; average age: 33.4±10.9 years). Complications were recorded for each patient at times of reexamination. Over the 5-year observation period, the 83 patients wore lenses for more than 26 months. The average duration of use of 2WFR lenses was 14.5±2.7 days/lens (n=83) and subsequently 1.03±0.12 days/lens (n=83) for DD lenses. Compliance with the duration of use was consistently good as monitored by requests for lens resupply in both wearing modalities. The subjective complaint of dryness tended to consistently show improvement by the change to DD wear: 18.1% vs. 30.1% (P=0.10, Fisher exact test). Among eye complications noted in each group, the occurrence of superficial punctate keratitis (SPK) was significantly decreased in DD wear: 9.6% vs. 26.5% (P=0.008, Fisher exact test). The main reasons given by patients for changing to DD wear were (1) "DD lens wear was more hygienic" (78.6%) and (2) "DD lens use is more convenient for travel/business trips" (64.3%). Comments after the switch in wear were (1) "easy and convenient" (95.7%) and (2) "I don't have to worry about expiration dates" on solutions (57.1%). Overall, 95.7% of wearers making the change answered as "satisfied" and "mostly satisfied." In the subscription membership program, which provided free lens replacement and/or reexamination, individual compliance with duration of wear in 2WFR wear cycles was good; however, these patients switching to DD wear tended to have improvement in their subjective complaints of dryness and objectively demonstrated a significant reduction of SPK at follow-up examinations.
    Eye & contact lens 05/2015; DOI:10.1097/ICL.0000000000000167
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    ABSTRACT: This review focuses on conjunctival goblet cells and their essential function in the maintenance of eye health. The main function of goblet cells is to produce and secrete mucins that lubricate the ocular surface. An excess or a defect in those mucins leads to several alterations that makes goblet cells central players in maintaining the proper mucin balance and ensuring the correct function of ocular surface tissues. A typical pathology that occurs with mucous deficiency is dry eye disease, whereas the classical example of mucous hyperproduction is allergic conjunctivitis. In this review, we analyze how goblet cell number and function can be altered in these diseases and in contact lens (CL) wearers. We found that most published studies focused exclusively on the goblet cell number. However, recent advances have demonstrated that, along with mucin secretion, goblet cells are also able to secrete cytokines and respond to them. We describe the effect of different cytokines on goblet cell proliferation and secretion. We conclude that it is important to further explore the effect of CL wear and cytokines on conjunctival goblet cell function.
    Eye & contact lens 05/2015; DOI:10.1097/ICL.0000000000000158
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    ABSTRACT: We present a unique case involving a 6-year-old female with a unilateral corneal endotheliitis-like finding, who was ultimately found to have a form of anterior diffuse infiltrating retinoblastoma with no evidence of retinal involvement. The patient's presumed endotheliitis was initially treated with topical dexamethasone and oral acyclovir without improvement. She then underwent multiple fine-needle aspirations of anterior chamber fluid, which were negative for abnormal findings of viral polymerase chain reaction, viral cultures, and flow cytometry. Months after initial presentation, an anterior chamber angle mass developed and a biopsy identified retinoblastoma cells. The patient underwent plaque radiotherapy of the cornea and systemic chemotherapy. The patient regained good vision and is tumor-free at 13 months. Anterior inflammation is a rare form of masquerade syndrome associated with retinoblastoma; however, it tends to be associated with diffuse posterior segment retinoblastoma when it does occur. Diffuse anterior retinoblastoma is a rare form of retinoblastoma with no apparent focus in the retina. Ultimately, our patient developed an anterior chamber angle lesion, which was biopsied and proven to be retinoblastoma. Unusual corneal endotheliitis-like findings in children that are not responsive to conventional treatment should raise the clinician's suspicion of malignancy, even when no retinal lesion is detected.
    Eye & contact lens 05/2015; DOI:10.1097/ICL.0000000000000113
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    ABSTRACT: To evaluate the results of toric intraocular lens (IOL) implantation in patients with cataract and postpenetrating keratoplasty astigmatism. Seven eyes of 7 patients with cataract and more than 3.5 diopters (D) astigmatism following penetrating keratoplasty were included in this retrospective case series study. All of the eyes underwent phacoemulsification and Acrysof toric IOL (t5-t9) implantation at least 6 months later than the complete suture removal. Corrected visual acuity (CVA), manifest astigmatism, the keratometry measurements, and complications were assessed. The mean preoperative CVA significantly increased (0.7±0.3 [range: 0.3-1.3] logMAR to 0.1±0.04 [range: 0.05-0.15] logMAR; P<0.05) at mean 8.71±4.11 months after the surgery. The mean preoperative corneal astigmatism and the average manifest refractive astigmatism at the last visit were 5.4±0.9 D (range: 4.25-7 D) and 1.6±0.6 D (range: 0.5-2.5 D), respectively. The mean attempted cylinder correction at spectacle plane was 4.3±0.9 D (range: 2.4-4.7 D) whereas the mean cylinder correction was 4.6±0.5 D (range: 3.9-5.9 D), showing a slightly tendency for overcorrection. All eyes (100%) were within 1 D of predicted residual astigmatism. No complication occurred during the follow-up. Toric IOL implantation seems to be an effective, predictable, and safe procedure in patients with cataract formation and high astigmatism after penetrating keratoplasty.
    Eye & contact lens 05/2015; DOI:10.1097/ICL.0000000000000147
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    ABSTRACT: To evaluate the results of using AcrySof toric intraocular lenses (IOLs) in the cataract surgery of patients with keratoconus (KCN). In this study, 23 eyes of 17 patients with KCN who underwent cataract surgery using the toric IOL were evaluated. The amount and axis of the corneal astigmatism were measured by manual keratometry, corneal topography, refractive map of the Pentacam, and equivalent K reading of the Pentacam in all patients. The mean uncorrected visual acuity increased significantly 3 months after the surgery (P<0.01). The mean best-corrected visual acuity was 0.28±0.10 logMAR, 0.51±0.52 logMAR, and 0.83±0.55 logMAR before the surgery and 0.16±0.09 logMAR, 0.18±0.12 logMAR, and 0.35±0.13 logMAR after the surgery in the mild, moderate, and severe KCN groups, respectively (P<0.01). The mean IOL rotation was 2.50±1.18 degrees, 2.50±1.51 degrees, and 2.67±1.15 degrees in the mild, moderate, and severe KCN groups. The lowest mean absolute error was seen in the mild and moderate KCN groups with corneal topography-derived keratometry using the SRK/T formula and in the severe KCN group with corneal topography-derived keratometry and manual keratometry using the SRK/T and SRK II formulas. The use of toric IOLs resulted in desirable vision and refraction in the cataract surgery of patients with nonprogressive KCN. As for determining the IOL power, it seems that keratometry derived from the 3 mm central zone in the axial map of corneal topography using the SRK/T formula has the lowest error.
    Eye & contact lens 05/2015; DOI:10.1097/ICL.0000000000000136
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    ABSTRACT: To evaluate neophyte contact lens wearers' fitting to rigid gas permeable (RGP) contact lenses in terms of wearing time, tear volume, stability, corneal staining, and subjective ratings, over a 1-month period of time. Twenty-two young healthy subjects were enrolled for wearing RGP on a daily wear basis. The participants included in this study never wore contact lenses and showed a value under 10 in McMonnies Questionnaire. Contact Lens Dry Eye Questionnaire, Visual Analog Scales, Schirmer test, tear film break-up time (BUT), and corneal staining grading were performed. Follow-up visits were scheduled at 1, 7, 15, and 28 days. Six subjects dropped out due to discomfort from the study before 1 month (27% of discontinuation rate). Successful RGP wearers (16 participants) achieved high levels of subjective vision and reported comfort scores of approximately 9 of 10 between 10 and 15 days. They reported wearing their lenses for an average of 10.12±2.43 hr after 1 month of wear. Conversely, unsuccessful wearers discontinued wearing the lenses after the first 10 to 15 days, showing comfort scores and wearing time significantly lower compared with the first day of wear. Schirmer test showed a significant increase at 10 days (P<0.001), and the BUT trends decreased after the first week of wear in unsuccessful group. Symptomatology related with dryness and discomfort, detected during the first 10 days of the adaptation, may help the clinician to predict those participants who will potentially fail to adapt to RGP lens wear.
    Eye & contact lens 05/2015; DOI:10.1097/ICL.0000000000000153