A decade later, during the first to third decades of life, visual acuity decreases because of progressive macular degeneration, leading in many cases to blindness between
[orpha.net]
Visual acuity decreases slowly in spite of significant deterioration of cone- and rod-mediated retinal function.
[disorders.eyes.arizona.edu]
Pattern reversal VEPs were very subnormal, even in patients with mild deterioration of visual acuity.
[ncbi.nlm.nih.gov]