Macular thickness and aging in retinitis pigmentosa.
ABSTRACT This study was designed to analyze macular tomography in patients of different ages with retinitis pigmentosa (RP) and correlate their visual function with macular thickness, which was measured by optical coherence tomography.
In all, 75 RP patients and 75 controls were stratified into three age groups and macular thickness was measured by optical coherence tomography. The tomography was subdivided into three circular zones, four quadrants, and nine areas for analysis. Ophthalmic examinations, which involved ophthalmoscopic examinations, dark adaptation tests, visual acuities, visual field examinations, electrooculography, and color sense discrimination tests, were performed.
Macular thickness of the RP patients decreased in the middle age group (45- to 55-year old), whereas the oldest group showed an increased thickness. The thickness of the outer inferior area remained virtually unchanged, whereas the thickness of the inner temporal area showed the most fluctuation with age. In terms of circular sections, the most dramatic changes in macular thickness were observed in the fovea, and the aging effect decreased outward to the outer ring. Furthermore, the thickness of the fovea was more important than the thickness of the inner ring and the outer ring for electrooculography, visual acuity, and color sense discrimination in RP patients.
In middle age RP patients, the macular thickness decreased, whereas an increased thickness was observed in patients older than 55 years. In addition, the inner temporal area was the most fragile, and the outer inferior area was the least affected in patients with RP.
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ABSTRACT: To assess changes in measures of visual function in patients with retinitis pigmentosa (RP) over time. Patients with RP and visual acuity of 20/40 or better and central visual fields of 10 degrees or larger were enrolled in a 9-year prospective study. The following measures of visual function were obtained annually over the follow-up period: visual acuity, Goldmann visual fields (V4e target), focal electroretinograms, and hue discrimination. Over the follow-up period, the averaged group data showed changes in all measures of visual function. The smallest amount of change occurred for visual acuity and hue discrimination, and the greatest amount of change occurred for visual field area. Examination of individual patient data over the follow-up period indicated that the rates of change varied among patients and that losses in function for one measure did not correlate well with losses on other measures. These results stress that although visual function deteriorated over time for this group of patients with RP, there were differences among our measures of visual function. Measures that primarily assess central retinal function change relatively slowly compared with measures that assess more peripheral retinal function.Ophthalmology 04/1996; 103(3):398-405. DOI:10.1016/S0161-6420(96)30679-9 · 6.17 Impact Factor
British Journal of Ophthalmology 06/2007; 91(5):699-701. DOI:10.1136/bjo.2006.104463 · 2.81 Impact Factor
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ABSTRACT: To correlate the dimension of the visual field (VF) tested by Goldman kinetic perimetry with the extent of visibility of the highly reflective layer between inner and outer segments of photoreceptors (IOS) seen in optical coherence tomography (OCT) images in patients with retinitis pigmentosa (RP). In a retrospectively designed cross-sectional study, 18 eyes of 18 patients with RP were examined with OCT and Goldmann perimetry using test target I4e and compared with 18 eyes of 18 control subjects. A-scans of raw scan data of Stratus OCT images (Carl Zeiss Meditec, AG, Oberkochen, Germany) were quantitatively analyzed for the presence of the signal generated by the highly reflective layer between the IOS in OCT images. Starting in the fovea, the distance to which this signal was detectable was measured. Visual fields were analyzed by measuring the distance from the center point to isopter I4e. OCT and visual field data were analyzed in a clockwise fashion every 30 degrees , and corresponding measures were correlated. In corresponding alignments, the distance from the center point to isopter I4e and the distance to which the highly reflective signal from the IOS can be detected correlate significantly (r = 0.75, P < 0.0001). The greater the distance in VF, the greater the distance measured in OCT. The authors hypothesize that the retinal structure from which the highly reflective layer between the IOS emanates is of critical importance for visual and photoreceptor function. Further research is warranted to determine whether this may be useful as an objective marker of progression of retinal degeneration in patients with RP.Investigative ophthalmology & visual science 05/2008; 49(8):3617-21. DOI:10.1167/iovs.08-2003 · 3.43 Impact Factor