Lens晶状体 Transparent biconvex structure, covered by an elastic transparent capsule Located between iris and vitreous body, and suspended behind pupil by ciliary zonule睫状小带 Shape changed by the ciliary muscle: for near vision, the ciliary muscle contracts and the lens rounds up, while for distant vision the lens flattens out so that the eye may be focused on distant objects
Lens 晶状体 ◼ Transparent biconvex structure, covered by an elastic transparent capsule ◼ Located between iris and vitreous body, and suspended behind pupil by ciliary zonule 睫状小带 ◼ Shape changed by the ciliary muscle: for near vision, the ciliary muscle contracts and the lens rounds up, while for distant vision the lens flattens out, so that the eye may be focused on distant objects
Vitreous body玻璃体 Consists of colorless transparent jelly-like substance in which there is a meshwork of fine fibrils occupies the vitreous chamber, the space between lens and retina Helps maintain the shape of eyeball and supports the etina
Vitreous body 玻璃体 ◼ Consists of colorless, transparent jelly-like substance in which there is a meshwork of fine fibrils, occupies the vitreous chamber, the space between lens and retina ◼ Helps maintain the shape of eyeball and supports the retina
Refractive media of eye折光装置 Bend entering light waves and Nearly parallel rays focus them on the retina from distant object Cornea Aqueous humor Lens Lens Vitreous body (A)Viewing distant object Light ray before Divergent rays from close object Air Ught ray aft tractor (B) Accommodation
Refractive media of eye折光装置 Bend entering light waves and focus them on the retina ◼ Cornea ◼ Aqueous humor ◼ Lens ◼ Vitreous body
(a) Normal(emmetropic)eye (d) Farsighted (hypermetropic)eye, uncorrected Convex lens e)Farsighted (hypermetropic)eye, corrected (b)Nearsighted(myopic)eye, uncorrected Concave len Irreqular Irregular ≠ cornea lens ( c)Nearsighted (myopic)eye, corrected (f) Astigmatism from (g)Astigmatism from an irregular cornea an irregular lens
Accessory organs of eye眼副器 Eyelids眼睑 Conjunctiva结膜 Lacrimal apparatus泪器 Ocular muscles眼球外肌 Connective tissue in the orbit
Accessory organs of eye 眼副器 Eyelids 眼睑 Conjunctiva 结膜 Lacrimal apparatus 泪器 Ocular muscles 眼球外肌 Connective tissue in the orbit