Step 1: Go to DMVs website and print out the medical waiver sheet.

Step 2: Go to the eye doctor, have them fill out the medical related section of the form and mail it to the Richmond office.

Step 3: In a month or so you should recieve special registration cards for the vehicles listed on the waiver.

Problem solved.
There is still a tint level restriction with a waiver, but 98% of the time the cop won't even check after they see the registration. Even if you are below the waiver limit, I find it unlikely they will write you due to having a documented medical condition and your chances if you file suit for being harassed based on that.