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C.R. Robson, J.M. Wild, J.E. Morgan, R.V. North; Ocular Media Properties and Short Wavelength Automated Perimetry . Invest. Ophthalmol. Vis. Sci. 2003;44(13):67.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: To identify ocular media properties influencing the increased between-subject normal variability of SWAP compared with conventional white-on-white (W-W) automated perimetry. Methods: One eye of 25 subjects (mean age=66.5 yrs; range 42-82) with varying degrees of media opacity (LOCS III mean 0.66, SD 0.92, range 0.0-4.0) was examined over three visits. At the initial visit, the Van den Berg straylight meter was used to obtain values for forward light scatter; disability glare was measured using the Brightness Acuity Tester (BAT) and the Early Treatment of Diabetic Retinopathy Study (ETDRS) chart at 96% and 10% contrast; 3 training visual field examinations were undertaken (2 SWAP, 1 W-W) using the Humphrey Field Analyzer 750, the results of which were discarded. The second visit consisted of ocular media absorption (OMA) measurement and 2 visual field examinations (1 SWAP, 1 W-W) utilising Program 24-2. The final visit involved lens assessment, using LOCS III and fundus examination after pupil dilation and IOP measurement. Results: Little relationship was found between SWAP Mean Sensitivity (MS), SWAP Mean Deviation (MD), and OMA (R2=0.023: R2=0.053); forward light scatter (R2=0.039: R2 =0.006); disability glare at 96% contrast (R2=0.002: R2 =0.0042) and at 10% contrast (R2 =0.074: R2 =0.008). The correlation between SWAP MS and age was markedly higher (R2 =0.3146). Little correlation was present between W-W MS, W-W MD and OMA (R2 =0.042: R2 =0.001); disability glare at 96% contrast (R2 =0.072:R2 =0.096) and at 10% contrast (R2 =0.051: R2 =0.031). The relationships between W-W MS and age (R 2=0.4508) and straylight was stronger (R2 = 0.3043). Conclusions: None of the measured ocular media properties were strongly associated with SWAP MS and therefore will not assist in the indentification of those individuals who have increased variability on SWAP.
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