TODAY'S LESSON ON SUNGLASSES. UV LIGHT, POMC, and HOW THEY ALL LINK TOGETHER. Ciliary ganglion controls how much light gets into the pupil and it controls the lens ability to refract and target light on certain parts of the retina. This is why a ciliary ganglionectomy has massive effects on melanin production in humans. Wearing sunglasses is a temporary way to give yourself a ciliary ganglionectomy. This is why sunglasses wearing leads to more sunburns. The ciliary ganglion contains postganglionic parasympathetic neurons that supply the ciliary muscle and the pupillary sphincter muscle. Because of the much larger size of the ciliary muscle, 95% of the neurons in the ciliary ganglion innervate it compared to the pupillary sphincter. Below see the detailed view of nerves of lateral orbit showing the ciliary ganglion immediately behind the globe of the eye.