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M4 Eye

the eye is connected to the brain by optic II cranial nerve
Layers of the eye 1. OUTER FIBROUS TUNIC 2. Chroid Layer 3. Sensory tunic
horizontal cells transmit _____ information from other photoreceptors to_____ cells inhibitory, bipolar
Which area is occupied entirely by cones fovea centralis
Horizontal cells transmit____ information inhibitory
fovea centralis is responsible for detailed perception
Away from the fovea the rods become more ______ numerous
Pigments of the rods is ______ Rhodopsin
Rhodopsin consist of 11-cis-retinal, and opsin protein
Myopia Eyeball is elongated,parallel light fall in front of the retina, CONCAVE
hyperopia Eyeball is too short, light fall behind retina, CONVEX
hyperopia CONVEX
Astigmatism surface of cornea is disfigured
Presbyopia By Aging, decline in the resiliency of the lens. Slow response in lens to focusing.
Sclera The outer protective coating of the eyeball
choroid is the dark membrane absorbs stray light
Behind the lense is Vitreous humor
The Shape, Refractive power of the lens is controlled by ciliary muscles
Accommodation The ability of the ciliary muscles to change the shape of the lens to focus objects at different distances onto the retina is called
coloured ring behind the cornea iris
The near point The closest distance that the eye can clearly focus on an object
Power of Accommodation The numerical difference between the refractive power of the eye when relaxed (infinity) and when fully accommodated (near point).
Rods are more sensitive than Cones, particularly in the wavelength range ______ nm 400-550
Each cone in the fovea centralis is connected directly to the _____ – visual cortex
Reduced pupil size in bright conditions improves depth of field
In myopia distant object light , IN FRONT of the retina,The eyeball is too long or the cornea is too steep (curved) CONCAVE LENSE
myopia Short-sighted
Hypermetropia Long-sighted, light focus BEHIND the retina,,The eyeball is too short or the cornea is flatter than normal
long-sighted A person cannot focus on any object that is closer than their Near Point
Presbyopia "old sight" is the reduction in accommodation that occurs with increasing age
The Refractive Power of any lens system is given by: P = 1/f (dioptres)
Power of Accommodation the difference in refractive power between the fully focussed eye, and the fully relaxed eye. P(acc) = P(NP) - P(infinity)
Power of Accommodation P(acc) = P(NP) - P(infinity)
Created by: Naser