Published in:
Open Access 01-12-2017 | Research article
Visual function improvement using photocromic and selective blue-violet light filtering spectacle lenses in patients affected by retinal diseases
Published in: BMC Ophthalmology | Issue 1/2017
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Background
To evaluate functional visual parameters using photocromic and selective blue-violet light filtering spectacle lenses in patients affected by central or peripheral scotoma due to retinal diseases.
Sixty patients were enrolled in this study: 30 patients affected by central scotoma, group 1, and 30 affected by peripheral scotoma, group 2.
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) were performed to all patients.
Test results with blue-violet filter, a short-pass yellow filter and with no filters were compared.
Results
All scores from test results increased significantly with blue-violet filters for all patients.
The mean BW-BCVA increased from 0.30 ± 0.20 to 0.36 ± 0.21 decimals in group 1 and from 0.44 ± 0.22 to 0.51 ± 0.23 decimals in group 2 (Mean ± SD, p < 0.0001 in both cases).
The mean WB-BCVA increased from 0.31 ± 0.19 to 0.38 ± 0.23 decimals in group 1 and from 0.46 ± 0.20 to 0.56 ± 0.22 decimals in group 2 (Mean ± SD, p < 0.0001 in both cases).
The letter count for the CS test increased from 26.7 ± 7.9 to 30.06 ± 7.8 in group 1 (Mean ± SD, p = 0.0005) and from 31.5 ± 7.6 to 33.72 ± 7.3 in group 2 (Mean ± SD, p = 0.031).
GT was significantly reduced: the letter count increased from 20.93 ± 5.42 to 22.82 ± 4.93 in group 1 (Mean ± SD, p < 0.0001) and from 24.15 ± 5.5 to 25.97 ± 4.7 in group 2 (Mean ± SD, p < 0.0001).
Higher scores were recorded with the Blue filter compared to Yellow filter in all tests (p < 0.05).
No significant differences in any test results could be detected between the Yellow filter and the No filter condition.
Conclusions
The use of a combination of photocromic lens with a selective blue-violet light filter showed functional benefit in all evaluated patients.