Colombo L et al. – This study evaluated the effect of photocromic and selective blue–violet light filtering spectacle lenses on functional visual parameters in patients affected by central or peripheral scotoma due to retinal diseases. The authors concluded that functional benefits were seen using a combination of the photochromic lens with a selective blue–violet light filter.

Methods

• A total of 60 patients affected with either central scotoma (group 1) or peripheral scotoma (group 2) were included for the study.
• The following tests were performed in all patients: Black on White Best Corrected Visual Acuity (BW–BCVA), White on Black Best Corrected Visual Acuity (WB–BCVA), Mars Contrast Sensitivity (CS), and a Glare Test (GT).

Results

• All scores significantly increased in all patients with blue–violet filters.
• Mean BW–BCVA increased from 0.30 ± 0.20 to 0.36 ± 0.21 decimals in group 1 versus 0.44 ± 0.22 to 0.51 ± 0.23 decimals in group 2 (mean ± SD).
• Mean WB–BCVA increased from 0.31 ± 0.19 to 0.38 ± 0.23 decimals in group 1 versus 0.46 ± 0.20 to 0.56 ± 0.22 decimals in group 2 (mean ± SD).
• CS test letter count increased from 26.7 ± 7.9 to 30.06 ± 7.8 in group 1 versus 31.5 ± 7.6 to 33.72 ± 7.3 in group 2 (mean ± SD).
• Significant reduction in GT was observed: letter count increased from 20.93 ± 5.42 to 22.82 ± 4.93 in group 1 versus 24.15 ± 5.5 to 25.97 ± 4.7 in group 2 (mean ± SD).