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WorksheetsPhysiology of vision
Total questions: 15
Worksheet time: 5mins
Which part of the eye is responsible for accomodation?
Cornea
Lens
Retina
Iris
What helps in colour perception
Ganglion cells
Cones
Rods
Horizontal cells
The blind spot in the eye is due to
Lack of blood supply
Presence of extra rods
Overlapping of images
Absence of photoreceptors
What is the function of pigment epithelium of retina
Production of aqueous humor
Reflects light
Regenerates photo pigments
Focuses light
Which layer of retina contains first synapse of visual pathway
Ganglion cell layer
Photoreceptor layer
Inner nuclear layer
Outer nuclear layer
Inside a dark cave or tunnel what will happen to your pupil size
Pupil will constrict due to parasympathetic input
Pupil will dilate due to sympathetic input
Pupil size remains unchanged
Controlled by rods
What is the first step of phototransduction
Opening of Na + channels
Release of glutamate
Conversion of 11 cis retinal to all trans retinal by isomerase
Activation of transducin
Which cells provide lateral inhibition to inhance contrast in retina
Ganglion cells
Amacrine cells
Horizontal cells
Bipolar cells
What happens to cGMP receptors after light exposure
They increase
They decrease
Levels unchanged
Convert into AMP
During dark what happens to photoreceptors
Depolarize and release glutamate
Hyperpolazie and so remain silent
Depolarize and silent
Inactive and do not consume energy
Light adaptation is the process by which the eye
Adjusts from dim to bright light
Dilates pupil
Increases Rhodopsin production
Focuses distant objects
Delayed dark adaptation refers to
Inability to focus in bright light
Slower recovery of vision after entering a dark room
Visual hallucinations in dark
Increased sensitivity to light
A child complains of bumping into objects in night with normal vision in day time.What is the most likely cause
Cataract
Macular hole
Vitamin A deficiency
Glaucoma
Highest density of rods in human retina is found at
Just outside the fovea - perifovial region
Far periphery
Fovea centralis
Optic disc
Approx how may rods are present in human retina
1 million
6 million
120 million
250 million
