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Vivian Choh, Jacob G. Sivak, Stephen D. Meriney; A Physiological Model to Measure Effects of Age on Lenticular Accommodation and Spherical Aberration in Chickens. Invest. Ophthalmol. Vis. Sci. 2002;43(1):92-98.
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purpose. To assess physiological accommodative function of intact intraocular
lenses, as measured by focal length changes, in chickens of various
methods. Eyes of white leghorn chickens, aged 0 days (hatchlings), 7 days, 14
days, 6 weeks, 1 year, and 2 years, were enucleated and the backs of
the globes, except for the ciliary nerve and ganglion, were removed.
The ciliary nerve and ganglion were suctioned into the tip of a suction
electrode, and lenses were optically scanned before, during, and after
accommodation. Accommodation was elicited by delivery of 30-Hz
results. For all age groups, lenticular focal lengths for stimulated eyes were
significantly shorter than for relaxed eyes, indicating that
accommodation had been induced. Lenticular accommodative amplitudes
decreased significantly with age, with reduced function occurring
between 0 and 7 days and again between 14 days and 1 year. Although
accommodation was associated with an increased spherical aberration in
all age groups, the increase was significant only in some age groups.
conclusions. Results showing reduction of lenticular accommodation concomitant with
increasing age suggest that in spite of major differences in anatomy
and physiology of the accommodative mechanism, chickens may become
presbyopic. Results showing high amounts of nonmonotonic spherical
aberration in hatchling lenses suggest inherently poor optics in these
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