Are Your Glasses Causing Your Headaches?

Vision is the result of a complicated network of nerves, muscles, and eye structures that all work together to create picture-perfect images. Wearing the wrong glasses can cause these structures to malfunction, causing headaches or migraines. Here's how it works:

Images enter the eye through the cornea (a clear membrane that covers the lens), travel through a focusing lens (the colored part of the eye and pupil), and strike a light sensitive surface (optic retina) that converts it to nerve impulses. These impulses then travel to the optical center in the brain (occipital cortex) where they are converted into the images we see.

Muscles around the lens contract or relax to change the shape of the lens. Contracted eye muscles make the lens rounder to bring nearby objects into focus. Relaxed eye muscles make the lens flatter so it can focus on far away objects. Muscles are also responsible for eye movement, letting us look up and down, side to side, and allowing both eyes to move in a synchronized, coordinated way. Muscles bring the images from each eye together to form one picture (fusion). 

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