Abstract:
:This paper customizes Bennett's equation for calculating lens power in chicken eyes from refraction, keratometry and biometry. Previously published data on refraction, corneal power, anterior chamber depth, lens thickness, lens radii of curvature, axial length and eye power in chickens aged 10-90 days were used to estimate Gullstrand's lens power and Bennett's lens power for chicken eyes, and to calculate the lens equivalent refractive index. Bennett's A and B constants for the front and back surface powers of the lens were calculated for data measured from day 10 to 90 at 10 day intervals, and mean customized constants were calculated. The mean customized constants for Bennett's equation for chicks were A=0.574±0.023 and B=0.379±0.021. As found previously, lens power decreases with age in chicks, while corneal power decreases and axial length increases. The lens equivalent refractive index decreases with age from 10 to 90 days after hatching. Bennett's equation can be used to calculate lens power in chicken eyes for studies on animal myopia, using standard biometry.
journal_name
Vision Resjournal_title
Vision researchauthors
Iribarren R,Rozema JJ,Schaeffel F,Morgan IGdoi
10.1016/j.visres.2014.01.003subject
Has Abstractpub_date
2014-03-01 00:00:00pages
33-8eissn
0042-6989issn
1878-5646pii
S0042-6989(14)00005-4journal_volume
96pub_type
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