CAS PS 222 Lecture Notes - Lecture 5: Superior Rectus Muscle, Aqueous Humour, Optical Power

• School: Boston University
• Department: Psychological & Brain Sciences
• Course: CAS PS 222
• Professor: Andrea Mercurio

Document Summary

There are specialized muscles involved in moving the eye: Superior and inferior obliques (responsible for rotational movement). These muscles work in pairs to smoothly track things. Once we actually point our eyes to the object, how do we focus the image onto the retina of the eye: lens accommodation. As the object comes closer to you, light radiates radially; when object is fa, light radiates parallel. When the object is close, the lens has to work more (the lens fattens). The fatter the lens, the more the light bends: the cornea also contributes (2/3 of the optical power of the eye). It does a lot before the light reaches the lens: the size and shape of the eyeball, optic axis and length of the eyeball impact where the light is being focused. Optic axis is either in the front of the retina or behind it. Photons of light travel through the world and get detected by photoreceptors on the retina.