01:830:301 Lecture 6: Cones and Rods
9 Feb 2017
School
Department
Course
Professor
Document Summary
Main function is to maintain the shape of the eyeball. Muscles responsible for this is called ciliary muscles. When it is relaxed, the lens is relatively thin weak. When you need greater optical power, then the ciliary muscles contracts, and it changes the shape of the lens and makes it more condensed increases the optical power of the lens. Depending on distance of the object, the optical power of lens can be adjusted. More bending is required when the object is close so you need greater optical power. (because when the object comes closer, the muscle needs to bend bigger) Accommodation: contraction of the ciliary muscle that allows us to look/focus on nearby objects. (your ciliary muscles are going to be strained) 2 possibilities that both boil down to same condition/idea: eyeball too short, shape of eyeball is normal, but lens are too weak. Nearby objects are blurred (rays do not converge enough)
