Purchase this article with an account.
V. N. Pesala, L. Donovan, M. Taneja, Q. Garrett, S. Delgado, V. Sangwan, A. Ho; Measurement of Consensual Accommodation in Unsighted Eyes Using Auto-Refraction. Invest. Ophthalmol. Vis. Sci. 2010;51(13):804.
Download citation file:
© ARVO (1962-2015); The Authors (2016-present)
To measure the consensual accommodation in unsighted eyes (UE) when the fellow sighted eye (SE) accommodates.
Unilaterally blind subjects (n=63, mean age: 33.1 ± 13.8 years, range 9 to 62 years) were enrolled in the study. Subjects had clear ocular media; i.e. sufficiently clear for auto-refraction and can steadily fixate targets with the SE; thus no anterior segment injury or pathology in either eye that could compromise accommodation or use of any ophthalmic pharmaceuticals that could affect accommodation. All subjects had best distance corrected visual acuity (VA) of 20/30 or better in the SE and less than 20/400 in the UE. Accommodation was induced by instructing subjects to fixate on an N8 target at 40 and 33 cm. A 4/40 letter was presented at 4 m for distance measurements. A Shin-Nippon NVision- K5001 auto-refractor was used to measure the refractive state in the SE and UE in the unaccommodated and two accommodated states. The difference between distance and near spherical equivalent refractions for each eye was taken as the accommodation response (AR). The correspondence of AR between the SE and the UE was tested by paired t-test and regression analysis.
There was no significant difference in mean AR between SE and UE at 40 cm (p=0.40) and 33 cm (p=0.24). However, differences may have been masked by the wide range of AR. Regression analysis of the Bland-Altman plots suggests that at both near distances, UE accommodated slightly but statistically significantly more (0.20 D/D, p=0.022 and 0.16 D/D, p=0.015 for 40 cm and 30 cm respectively) than the companion SE.The same test on 15 normal subjects using IR-pass filters to simulate one UE produced similar trend but were not statistically significant (p=0.71 for 40 cm and 0.075 for 25 cm respectively).
In unilaterally blind subjects without accommodative system abnormalities, the AR in UE is slightly higher than the fellow SE.
This PDF is available to Subscribers Only