Relationship between axial length of the emmetropic eye and the age, body height, and body weight of schoolchildren.
ABSTRACT This report assesses the relationship of axial length of emmetropic (without refractive error) eyes to age, height, and weight in 1,600 Croatian schoolchildren. Axial eye lengths were determined by an ultrasonic eye biometry (A scan). Axial length of both eyes increases with age, height, and weight but shows a closer correlation to height and weight than to age. Boys have a significantly longer axial eye length than girls (P < 0.01). Boys or girls of similar or nearing body height and body weight and with emmetropic eyes have close linear measures of anatomic eye structures within their sex, regardless their age. Body height demonstrates the closest correlation to the growth and development of the emmetropic eye.
SourceAvailable from: trace.tennessee.edu
[Show abstract] [Hide abstract]
ABSTRACT: Purpose: To report on calculated lens power in adults in relation to other ocular components of refraction, analyzed in relation to secular change in height and education. Methods: The first phase of the Shahroud Eye Cohort Study is a cross-sectional population-based study in Iranian subjects 40-64 years-old. Data on cycloplegic spherical equivalent refraction and the ocular components of the right eyes were used for the calculation of crystalline lens power with Bennett's formula. Interactions between gender and age as independent variables were analysed by two way analysis of variances. Results: Cycloplegic refraction data and biometry were obtained from 4592 subjects, of whom 2666 (58%) were women. The mean lens power showed a biphasic trend. Up to the age of 50, younger subjects had lower lens power than older subjects, but after the age of 50, older subjects had lower lens power. A secular trend in height was found, with younger subjects significantly taller than older ones. Taller men or women had longer eyes, with flatter corneas and less powerful lenses, independent of refractive error. In multiple regression models, corneal power (p<0.001), axial length (p<0.001) and lens power (p<0.001) were all associated with height, independent of age and gender. Conclusion: There was an unexpected biphasic pattern of the distribution of lens power with age in this cross-sectional study. Younger subjects were taller, and despite having longer axial lengths, their bigger eyes were still predominantly emmetropic. The greater axial lengths were counterbalanced by both lower corneal and lower lens powers.Investigative ophthalmology & visual science 01/2014; 55(2). DOI:10.1167/iovs.13-13575 · 3.66 Impact Factor
[Show abstract] [Hide abstract]
ABSTRACT: Purpose: To evaluate the choroidal thickness and volume in healthy pediatric individuals by swept-source optical coherence tomography (SS-OCT) and to compare the findings to those of adults. Methods: One hundred eyes of 100 healthy pediatric volunteers (3-15 years) and 83 eyes of 83 healthy adult volunteers (24-87 years) were examined by SS-OCT with a tunable long wavelength laser source. The three-dimensional raster scan protocol was used to construct a chroidal thickness map. When the built-in software delineated an erroneous chorioscleral border in the B-scan images, manual segmentation was used. Results: The central choroidal thickness and volume within a 1.0-mm circle were significantly larger in the children (260.4±57.2μm, 0.205±0.045mm(3)) than in the adults (206.1±72.5μm, 0.160±0.056 mm(3); both P<0.0001). In the children, the mean choroidal thickness of the nasal area was significantly thinner than that of all other areas (P<0.005). Pediatric choroidal thinning with increasing age in the central area was faster than that in the outer areas. Stepwise regression analysis showed that the axial length and body mass index had the highest correlation with the choroidal thickness ( R(2)=0.313, P<0.0001). Conclusions: The macular choroidal thickness and volume in the pediatric individuals were significantly larger than those in the adults. The pediatric choroidal thinning with increasing age is more rapid in the central area. Pediatric choroidal thickness is associated with several systemic or ocular parameters, especially the axial length and body mass index. These differences should be remembered when the choroidal thickness is evaluated in pediatric patients with retinochoroidal diseases.Investigative ophthalmology & visual science 10/2013; 54(10). DOI:10.1167/iovs.13-12350 · 3.66 Impact Factor