Sclerotic:- The first part of the eye is Sclerotic. Sclerotic is the outer coating of the eye . Which is white in colour, that protects the interior of the eye and provide the shape of the eye. Cornea:- The first part of the Sclerotic is transparent to light is termed as Cornea The light coming from an object enter the eye through Cornea.
Lying behind the cornea, the iris is the eyeas equivalent of a cameraas shutter. It is responsible for controlling pupil size and thus the amount of light that enters the eye. The double convex eye lens helps the retina form an image by refracting light.
Ciliary muscles are responsible for holding the eye lens in place. These muscles also help the eye change focal length. The pupil is essentially a hole in the center of the iris that allows light to reach through to the lens.
Aqueous Humour:-The space between cornea and eye lens is filled with transparent fluid called aqueous humour. Blind Spot:- The region of eye containing the optic nerve is not at all sensitive to light and is called blind spot. If the image of an object is formed in the blind spot, it is not visible. Vitreous Humour:- The space between eye lens and retina is filled with a transparent jelly like transparent fluid called VitreousHumour.
Made up of light sensitive cell located at the back of the eye lens, the retina serves as the eyeas screen. It is here that images are formed before being sent to the brain by the optic nerve. The optical system of the eyeas principal axis is the dotted line XY axis.
Yellow Spot:-The central part of retina lying on the optic axis of eye is most sensitive to light and is called yellow spot. Eye Lids:- Eye lids provided to control the amount of light falling on the eye. They also protect the eye from dust particles etc.
Power Of Accomodation Of Eye:- Our eye can see the objects which are far away as well as near to it. The propert of the eye that enable the eye to accomodate on the various objects at various distance by altering the power the power of eye lens is called its power of accomodation. Image of the object is formed at retina. The distance between the optical center of the lens and retina is fixed. Ciliary muscles change the focal length of the eye lens by changing its curvature. Therefore the image of the objects situated at the different distances are formed clearly at the retina.
A human eye can have various defects including Myopia and Hypermetropia. Myopia occurs when a person’s eye can focus on close objects but not distant one. Hypermetropia occurs when a person’s eye can focus on distant objects but not close ones.
