[Ocular biometry in children with hypermetropia: utility of the Lenstar LS 900 optical biometer (Haag-Streit(®))].
ABSTRACT Biometric measurements were recorded in the eyes of 238 children with hypermetropia (3-16 years of age), using the Lenstar 900 biometer (Haag-Streit(®)) with no contact. Four refractive groups were divided by objective refraction and spherical equivalent (group 1, more than 6.00 D; group 2, +4.50 to +99 D; group 3, +3.00 to +4.49 D; group 4, +1.50 to +2.99 D). Many parameters (i.e., axial length of the eye, anterior chamber depth, crystalline lens thickness, and central pachymetry) were analyzed in refractive groups. Two statistical analyzes were carried out: Pearson correlations on the various measurements and nonparametric tests (LSD tests).
This statistical study showed the refractive characteristics of this pediatric population and the incidence of refraction on ocular biometry. There was a correlation between crystalline lens thickness, axial length, and anterior chamber depth. Axial length was significantly correlated in a positive way with age (r=0.332, p<0.001) and with anterior chamber depth (r=0.403, p<0.001), and in a negative way with crystalline lens thickness (r=-0.427, p<0.001). The study of refractive group parameters found a significant difference (p<0.01) between groups in axial length level. Anterior chamber depth decreased when the spherical equivalent increased. The study of crystalline lens thickness found a significant difference (p<0.01) between all four groups and pachymetry, as well as between groups 1 and 4 (p<0.05).
The Lenstar LS 900 biometer (Haag-Streit(®)) provided a complete biometrical assessment of children's eye in a single and easy measurement procedure. In this pediatric population with hypermetropia, axial length of the eye was mainly correlated with spherical equivalent and other biometric parameters. The relation between these various parameters was influenced and modified by age.
- SourceAvailable from: Juan J. Pérez-Santonja[Show abstract] [Hide abstract]
ABSTRACT: PURPOSE: Phakic intraocular lenses are being used increasingly to correct refractive errors. We studied the relationship between anterior chamber depth, refractive state of the eye, spherical equivalent refraction, axial length of the globe, corneal diameter, and keratometry. METHODS: Two hundred eleven eyes of 211 patients were enrolled. All eyes underwent the same protocol with a complete ocular examination that included slit-lamp microscopy, intraocular pressure, objective and subjective refraction, calculation of the spherical equivalent refraction, corneal pachymetry, anterior chamber depth, axial length of the globe, and keratometry. All results were analyzed statistically using SPSS statistics software. Correlations between different parameters were studied using the Pearson correlation test. RESULTS: The anterior chamber depth was found to correlate significantly with both the average corneal diameter and the axial length of the globe (0.744, 0.531, P < .01) and was also found to correlate through an inverse relation with both age and spherical equivalent refraction (-0.391, -0.623, P < .01). Corneal thickness and keratometric power did not correlate with the anterior chamber depth. CONCLUSION: Most parameters (axial length, corneal diameter, spherical equivalent refraction, patient age) affected anterior chamber depth and should be considered carefully when planning refractive procedures that employ phakic intraocular lenses.Journal of refractive surgery (Thorofare, N.J.: 1995) 16(3):336-40. · 2.47 Impact Factor
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ABSTRACT: To analyze the lens biometry obtained by Orbscan and A-scan ultrasound in normal eyes. and methods: The lens thickness obtained by A-scan ultrasound and the anterior curvature of the crystalline lens obtained by Orbscan were prospectively recorded in 280 normal eyes (including eyes with ametropia) of 140 patients (10-95 years of age). The correlation of lens biometry with the contralateral measure, patient age and sex, subjective refraction, and other ocular biometric parameters (anterior chamber depth, iridocorneal angle, corneal diameter, central pachymetry, pupil, corneal radii of curvature, and posterior segment length) was assessed. The lens anterior curvature showed no significant correlation in particular with the subjective spherical equivalent; however, the quality of this measure was poor: the reproducibility of the lens anterior curvature was low (the average difference between two successive Orbscan measurements was 14.4%). The correlation with the contralateral eye was poor (rs=0.55; p<0.001 versus rs=0.97; p<0.001 for lens thickness). Lens thickness showed the strongest correlation with the patient's age (rs=0.82; p<0.001); it increased by 0.26 mm per decade. Lens thickness correlated with anterior chamber depth (rs=-0.72; p<0.001) and iridocorneal angle (rs=-0.65; p<0.001). The last two parameters also correlated with age (rs=-0.68; p<0.001 and rs=-0.62; p<0.001, respectively). Anterior chamber depth and iridocorneal angle decreased by -0.21 mm and -1.7 degrees , respectively, per decade. Lens thickness is mainly influenced by age and correlates with the anterior chamber depth and the iridocorneal angle. The influence of aging on anterior segment biometry essentially consists in an increase in lens volume.Journal francais d'ophtalmologie 11/2005; 28(9):925-32. · 0.51 Impact Factor
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ABSTRACT: Determine the epidemiologic aspects and the degree of severity of different refractive errors in primary schoolchildren. A prospective and descriptive study was conducted from 1 December 2005 to 31 March 2006 on schoolchildren ranging from 4 to 16 years of age in a public primary school in Cotonou, Benin. The refraction was evaluated for any visual acuity lower than or equal to 0.7. The study included 1057 schoolchildren. The average age of the study population was 8.5+/-2.6 years with a slight predominance of females (51.8%). The prevalence of refractive error was 10.6% and astigmatism accounted for the most frequent refractive anomaly (91.9%). Myopia and the hyperopia were associated with astigmatism in 29.4% and 16.1% of the cases, respectively. The age bracket from 6 to 11 years accounted for the majority of refractive errors (75.9%), without age and sex being risk factors (p=0.811 and p=0.321, respectively). The average vision of the ametropic eye was 0.61, with a clear predominance of slight refractive errors (89.3%) and particularly of low-level simple astigmatism (45.5%). The relatively low prevalence of refractive error observed does not obviate the need for implementing actions to improve the ocular health of schoolchildren.Journal francais d'ophtalmologie 11/2008; 31(8):771-5. · 0.51 Impact Factor