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define the control of tear productioncontrol of tear production the lacrimal secretary system was initially thought to be comprised of two parts
contrast sense sense of contrast is the ability to perceive slight changes in luminance between regions which are not separated by definite borders
state in detail about dark adaptationdark adaptation is a phenomenon by which retina and pupil react to decreased illumination test is performed
define the term- adaptation the terms scotopic and photopic vision are relative to the lighting conditions of an individual place light adaptation is
explain about the light senseyou must be aware that when you enter into a cinema hall you are unable to see and
what do you mean by blinking and peering in the eyelidblinking and peering blinking considers as to the opening and closing movements of the eyelid
explain about the physiology of eyelid movementsphysiology of eyelid movementsit is quoted that the eyelids move more than any other part of the body
what are the functions of the eyelidsfunctions of the eyelidsthe eyelid makes the outer most layers covering the eye because of its strategic
define the objectives of eyelids lacrimal apparatus and tear film dynamicsby familiar with section you should be capable to understanda all the
explain the blood vitreous barrier as the physio-chemical propertyblood vitreous barrierthe blood vitreous barrier consists of three components tight
define about the ishiharas plates of eyesishiharas plates following plates are available- transformation vanishing hidden digit and diagnostic
illustrates the vitreous expansion and contraction in the physio-chemical propertyvitreous expansion and contraction the positive charge in na ions
what are the physio-chemical properties of vitreousphysio-chemical properties of vitreousvitreous is a clear gel like optically empty structure its
what is nagels anomaloscopethe patient is asked to match a yellow with a mixture of red and green wave lengths a defect can be detected based on the
explain about the holmgrens wools this is a matching test of coloured pieces of wool while this is not a highly
state the lantern test the patient names colours displayed in the lantern and the mistakes are analyzed this is not the best method of testing
determine the fransworth 100 hue panel testthis is a simple and useful test using colour chips arranged in a particular sequence colour deficient
describe in brief about pseudoisoehromatic plates testcommonly known as ishiharas plates these reveal one pattern to the normal eye and another to
explain about the incidence of defects in color visiondefects in colour vision can either be congenital or acquired males are more affected than
enumerate about the colour vision defectsacquired colour vision defects can occur afkr damage to the optic nerve or macula and in some cases because
determine about the trichromatic visiontrichromatic vision is the terminology used for normal vision those who require au three primary colours to
what is defective colour visiondefective colour vision is often called colour blindness the ability to appreciate one or more of the primary colours
give the details of colour visionthe genes for colour sense are located on the x chromosome recessive inheritance and on chromosomes 3 and 7 changes
youngs trichromatic theory according to youngs theory three types of cones exist each sensitive to a particular pigment-rythrolabe red chlorolabe
what are the three qualities specific to colour visionthere are three qualities specific to colour vision- hue saturation and brightnesshue hue is