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Eye

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Published in: Biology
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This note have information about the structure of eye and its diagram

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  1. Lens 1 .lt is made of transparent protein called crystallins. 2. It is bifocal by nature. 3. The anterior curvature is less than compared to the posterior curvature. 4. The lens focus the light on the retina which helps to get a clear image. 5. The lens is held by suspensory ligaments which are attached to the ciliary bodies. 6. The lens can be stretched or bulged to focus the light on retina coming from a different distance. This ability of lens is called as power of accommodation. Suz L Posterior part Of eye consist Of the following parts. 1. Schlera 2. Choroid 3. Retina Suq.r:å boarnen.t Ccnjundu&_ Schlera 7 ChD4Æ'.:cL spot
  2. 1. It is the only complete layer present in eye. 2. Cornea is a part of schlera. 3. It is white coloured layer. 4. It provides the surface to muscles for attachment that helps eye ball in its movement. 5. It also helps to maintain the shape of eyeball and protect it. Choroid 1. It is an incomplete and vascular layer. 2. It supplies blood to the eye and provides nutrients to the eye. 3. Choroid have extension called as ciliary part and iridal part. 4. The ciliary part of choroid and retina forms the ciliary body, while the iridal part of the choroid and retina make iris. both B dAL boö-, Retina 1. It contains photoreceptors called as cones and rods. 2. Retina works as a screen and image are formed here. 3. Exact opposite to pupil a depression s formed called as fovea. On fovea sharpest image is formed as the concentration of rod and cone cells is more. Retina consist of following parts 1. Pigment cells They contain melanin and are cuboidal cells with microvilli on them.
  3. 2. Rod and cone cells. (Photosensitive cells) a. Rod cells They are rod shaped cells and are responsible for scotropic vision. These cells help to see objects in dim light. It is also responsible for black and white vision. They contain a pigment called as Rhodopsin. b. Cones They are cone shaped cells and are responsible for photopic vision. These cells help to see object in bright light. It contains a pigment called as Iodopsin. 3. Bipolar ganglion When the photosensitive cells gets stimulated they pass the stimulations in the form of nerve impulses to bipolar ganglion which is depolarised (i.e. it can conduct impulses through it). The impulses from photosensitive cells travels through the Dendrites attached with the photosensitive cells. Further these impulses travel through the axon and reach to the nerve ending. 4. Retinal ganglion The nerve impulses from the bipolar ganglion reaches here via synapses between bipolar and retinal ganglion. These impulses then travel from dendrites of retinal ganglion to the axon after which these retinal ganglions nerve ending merges together to form optic nerve fibre. From here the message is taken to the brain via optic nerve.
  4. Ileqahaaquoadeqsatpu!ew!ewmsdlaqpueeu!luqoeauonqa!ldlaq P!nlJS!gI •wasaudS! plnlJSnOan!AuaqweLpsnoanlAap!sul snOa-n!A
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