Influence of blue light spectrum filter on SWAP and Standard Automated Perimetry

Abstract

Abstract: : Purpose: Evaluate the influence of blue light spectrum filter (BLSF) similar to intraocular lens developed to filter the short wave length of light up to the blue spectrum, in normal patients that underwent standard automated perimetry (SAP) and SWAP tests. Methods: Twenty eyes of 20 normal patients randomly performed a sequence of four Humphrey visual field tests: SAP 30–2 and SWAP full–threshold strategy, with and without the BLSF. All patients had intraocular pressure lower than 21 mmHg, normal fundus biomicroscopy, and no lens opacity. Differences regarding foveal threshold (FT), mean deviation (MD) and pattern standard deviation (PSD) were analyzed by paired t–test with Bonferroni multiple comparison correction. Results: There was a significant difference in the MD and FT mean for SWAP tests with and without the BLSF (p<0.0001). All the other parameters did not show statistically significant difference (Table). Table: Difference of MD, FT and PSD mean with and without BLSF, in each test. 

Conclusion: It was observed a statistical significance reduction in mean deviation and foveal threshold in the SWAP test when using the blue light spectrum filter.

Keywords: visual fields