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Effect of retinopathy of prematurity on scotopic spatial summation
Ronald M Hansen1, Jena L Tavormina1, Anne Moskowitz1
1Department of Ophthalmology, Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts, United States.
Purpose:
To evaluate scotopic retinal organization in retinopathy of prematurity (ROP) through a study of spatial summation.
Methods:
Thresholds for a range of stimulus diameters (0.4°-10°) were measured using a two alternative, spatial, forced choice psychophysical procedure. The critical diameter (DCRIT) for complete summation was estimated in subjects with a history of severe ROP (N = 7) and mild ROP (N = 17). Subjects who were born preterm and never had ROP (N = 16) and term-born subjects (N = 7) were also tested. The subjects ranged in age from 9 to 17 (median 13.5) years.
Results:
Critical diameter for complete spatial summation was significantly larger in ROP subjects than in subjects who never had ROP and in term-born control subjects. Critical diameter varied significantly with severity of ROP.
Conclusions:
The larger DCRIT values in ROP are consistent with altered organization of the post receptor retina. This may offer the ROP retina a strategy for achieving noise reduction and good dark-adapted visual sensitivity.
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