I don't see how you get prism eyeglasses from "drinking/sleeping pills stuff". People wear prisms because their eyes don't align properly. Their brain thinks they are looking in the same place, but one or both eyes are looking elsewhere. It is called diplopia. The prisms force the eye(s) into position. If not corrected, it causes double vision. I have it and have had 6 eye surgeries to correct it and I still have to wear prisms. Mine was caused by something called Graves Disease. Other things can cause it. My step-daughter developed some alignment problems recently and has had to start using prisms as well.
I’m quite sure that Hillary’s use of the prism glasses was short term following her concussion and resulting brain blood clot that led to hospitalization in late December 2012 to January 3, 2013. The Fresnel prisms were to correct double vision.
The prism glasses came about because of the concussion from a fall. My take - believe it or not - is that she got it from falling down in a drunken stupor.
I have had Grave's Disease for 20 years. At one point it began to affect my eyes, and I began to experience double vision. I did not take any corrective action, and found something very interesting. Apparently my brain compensated for the double vision, and "adjusted" my vision accordingly. As a result, I do not experience any double vision, and have not for many years. The human brain is an awesome organ designed by an awesome God.