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what is an accommodationaccommodation is the ability of the eye to focus on an object situated at variable distances from the eye like a camera even
what are important terms in accommodation and convergenceaccommodation and convergencein this section some important terms are includeda how a person
explain about the physiological accommodation physiological accommodation contractile power of the ciliary muscle required to change the focussing
what is physical accommodationphysical accommodation is the actual physical deformation in the lens power it is measured in diopters eg if the
what are the common changes in the eye other changes in the eye are1 increase in curvature of anterior surface of lens 2 anterior pole of lens moves
jackson coleman and fischer theoryjackson coleman theory during accommodation the ciliary muscle contraction causes an anterior thrust of the
state in brief about gullstrands theorya change in the lens is controlled by the balance between elasticity of the lens capsule and the pull of
explain in brief about the ciliary muscleduring accommodation the ciliary muscle contracts and in turn the size of the ciliary ring is reduced this
what is the curvature of the lens in a human being and most other mammals the first three mechanisms are not possible and accommodation occurs by the
mechanisms of different species of animal in an animal when the need to change the focal power of the eye arises different mechanisms are there in
what is human eye accommodationthe human eye focuses at objects at infinity without exerting any power this means that when a person is observing an
explain in detail about the optic nervethe optic nerve contains more than one million axons that initiate in the ganglion cell layer of the retina
state the layers of retina the retina is coilposed of ten layersa pigmented epithelium outermost layer b neusoepithelium rods and cones
explain about the optic discthe optic disc is also called a blind spot while the macula is referred to as the yellow spot the ora serrata the
describe in brief about retinathe retina is a highly complex layer of nervous tissue the photoreceptors are rods and cones for scotopic and photopic
determine about the nervous tissuesthe nervous tissues throughout the body including the visual nervous system are continuously active electrical
describe about the extra-ocular musclesthe extra-ocular muscles are mainly involved in the maintenance of postural tonicity and performance of quick
define about the pseudosquint pseudo-falsepseudosquint is the condition when despite the visual axis being parallel there appears to be a squint
non-concomitant or paralytic squint this subdivision of manifest squint occurs when there is a deviation of the eye in different directions the
explain in detail about the concomitant squintconcomitant squint is also called comitant squint it means i follow you ie in all directions of gazes
concomitant or non-paralytic squnitthis type of squint usually occurs when there is an obstacle in the sensory pathway of binocular reflex such as
what is manifest squint heterotropiamanifest squint is a deviation of one eye from the normal position when the fusion reflex is present the
state about the latent squint diseaselatent squint is seen commonly as exophoria in infancy and presbyopic age and esophoria in childhood
determine the categories of latent squintlatent squint category there are five subtypes1 esophoria2 exophoria3 hypophoria4
explain the term- latent squint anisophoria or heterophoria this eye condition occurs when the balance of extra-ocular muscles is altered there is a