Slitlamp assessment of age of onset and incidence of cataracts in pink-eyed, tan-hooded retinal dystrophic rats.

Abstract:

:Posterior subcapsular cataracts (PSC) are associated with hereditary retinal dystrophy in the Royal College of Surgeons (RCS) rat model and with human retinitis pigmentosa. The relationship of lens and retinal pathology has never been explained. Previous studies of pink-eyed RCS rats aged 2.5 to 11 months had shown an incidence of cataract of 24% when observed by the unaided eye and 60% by direct ophthalmoscopy, while 40% of rats were considered to have clear lenses. Unlike the retinal degeneration, which appeared in all homozygous animals, cataract seemed not to be predictably associated with the rdy mutation. To test this further, we studied the lenses of rats of different ages with a diagnostic slitlamp. We confirmed that by 8 to 15 months of age, rats fed a diet containing recommended concentrations of all known nutrients for rodents developed cataracts with an incidence of 23% when observed by unaided eye. In addition, opacities were seen in 74% with the indirect ophthalmoscope and 20 D lens; but 100% had at least a "sugar grain" type PSC by slitlamp. The slitlamp-detectable cataract was first seen in some animals by 49 days, and by 56 days all rats examined had bilateral PSC. This is an age at which the rod photoreceptors have degenerated. We concluded that slitlamp-detectable PSC are predictably associated with the retinal dystrophy of the rdy mutation. The RCS rat model may be relevant to a type of retinal degeneration having a constant association of cataract.

journal_name

Curr Eye Res

journal_title

Current eye research

authors

Hess HH,Newsome DA,Knapka JJ,Westney GE

doi

10.3109/02713688209011629

subject

Has Abstract

pub_date

1982-01-01 00:00:00

pages

265-9

issue

4

eissn

0271-3683

issn

1460-2202

journal_volume

2

pub_type

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