Eye Structure and Function http://www.dailymotion.com/related/x4mv6d_zoom-into-concrete_tech/video/x4mqrz_zoom-into-a-human-eye_tech Fat Opening: levator palpebrae superioris Closing: orbicularis oculi Cornea transplant “Relaxed” Fluid filled spaces • Aqueous humor • Vitreous humor Contains: •rods:-receptors for night vision •Cones: receptors for day vision and color •Macula lutea •Fovea centralis Presbyopia/Myopia • Farsightedness: can’t see close up • Nearsightedness: can’t see far away Colorblindness • X linked recessive trait that • most severe form of color causes a problem with the colorblindness is achromatopsia sensing granules (pigments) in cones. • rare condition in which a person can’t see any color, so • If just one pigment is missing, they see everything in shades you may have trouble telling the of gray. difference between red and green. This is the most common • lazy eye, nystagmus (small, type of color blindness. jerky eye movements), severe • If a different pigment is missing, light sensitivity, and extremely you may have trouble seeing poor vision. blue-yellow colors. People with blue-yellow color blindness usually have problems identifying reds and greens, too Astigmatism • optical defect in which vision is blurred due to the inability of the optics of the eye to focus a point object into a sharp focused image on the retina. • due to an irregular or toric curvature of the cornea or lens. Glaucoma Increased amount of pressure in the eye damage to the optic nerve is due to increased pressure in the eye, also known as intraocular pressure (IOP). Cataracts A cataract is a clouding of the lens in the eye that affects vision. Most cataracts are related to aging. By age 80, more than half of all Americans either have a cataract or have had cataract surgery. Retinal detachment Conjunctivitis Diplopia lasik