I've been mewing for the past two months and I've noticed that my eyes are less sensitive to light and also better night vision.(also probably not important to mention, but my under-eye circles are completely gone now)
A few months ago if I merely glanced at a light bulb it'd really hurt my eyes and leave me with an after-image for as long as 5 minutes.
I can safely look at a light bulb for about 3 seconds which leaves me with an after image that only lasts about a minute. Maybe it's placebo, but I'm absolutely certain that my eyes have become less sensitive to any bright light.
Have you started or stopped any vitamins? Do you see any changes in your eye region?