What is “central corneal thickness”, and what does it do for glasses?


I’ve been looking through online shopping for a nice pair of shades, when I came across the option, for one that I’m interested in, to have these shades either include or don’t include CCT.

But how does this affect the use of it, and will it affect my sight in the long term?

I did try to Google for an understanding but I think I’m too stupid to understand it in a non-conversational manner.

In: 8

This is a bit confusing because CCT can mean more than one thing and both involve eyes and vision. First, CCT can be referring to the thickness of your cornea, the front surface of your eye. This is valuable information, needed to treat various medical conditions, such as glaucoma. CCT can also mean Correlated Color Temperature, which is a way to measure how much blue and yellow light that a light source emits and how it affects the light’s appearance. For instance, when you buy light bulbs, they are sometimes rated as “soft” or “bright”. This is a simplified way of expressing the Correlated Color Temperature. Now, regarding sunglasses, some tints will not only darken everything, but will also distort natural colors. Others will retain the natural color qualities and simply make things darker. I’m only guessing that this usage of CCT you’re seeing is related to this. (whether greens will look a true green, reds will look a true red and so forth) If you just want shades that make things darker, CCT is not that important. If, on the other hand, you are in a situation where precise color identification is critical, CCT is an important consideration.