Visual Perceptual Learning Based on Adaptive Contrast Detection Training Enhances Vision and Contrast Sensitivity in Diabetic Retinopathy.
Kexin Cao, Sha Luo, Xiaotong Xiang et al.
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In 30 seconds
This randomized controlled trial evaluated 3-month home-based visual perceptual learning (VPL) in people with diabetic retinopathy who had received routine therapies. Of 36 randomized participants, 28 completed the study: 12 in the training group and 16 controls. In the VPL group, best-corrected visual acuity improved from 0.36 to 0.26 logMAR, with significant group-by-time effects for visual acuity, grating acuity, and motion contrast sensitivity. Vision-related quality of life also improved, while OCT angiography parameters remained stable in both groups.
Key findings
- In the VPL group, best-corrected visual acuity improved from 0.36 to 0.26 logMAR (P = 0.003).
- Grating acuity increased from 12.42 to 17.47 cycles per degree (2.96 dB), with a significant group × time interaction (P < 0.001).
- Motion contrast sensitivity increased from 64.26 to 83.42 (2.27 dB), with a significant group × time interaction (P < 0.001).
- LVQOL increased (+4.33; P < 0.001), whereas OCTA parameters remained stable in both groups.
Why it matters
The findings suggest that visual function in diabetic retinopathy may retain capacity for improvement through perceptual training, including measures beyond the trained detection task. The concurrent gains in visual acuity, contrast-related outcomes, and quality-of-life scores support further evaluation of VPL as a potential adjunct to routine care, while stable OCTA measures indicate that the reported functional changes were not accompanied by measured vascular changes.
What to keep in mind
Only 28 of 36 randomized participants completed the study; eight were excluded for poor adherence or incomplete follow-up. The abstract reports a 3-month training period and does not provide longer-term outcomes.