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Sensory Physiology

special senses

refracted when light rays pass from one medium to another,their velocity or speed of transmission changes, and the rays are bent or refracted.
Accommodation the ability of the eye to focus deferentially for objects of near vision (less than 6 m, or 20 feet)
real image the image formed on the retina as a result of the refractory activity of the len
emmetropic eye is able to accommodate properly. visual problem may result -from lenses that are too strong or too lazy (overconverging or underconverging, respectively). -
Myopia near sightedness. the image normally focuses in front of the retina. a person can see close object without difficulty. correction require a concave lens which causes the light reaching the eye to diverge.
Hyperopia farsightedness. the image focuses behind the retina. a person have no problem with distant vision, but need glasses with convex lenses to augment or increase the converging power of the lens for close vision
astigmatism irregularities in the curvatures of the lens and/or the cornea lead to a blurred vision problem. Correction--cylindrically ground lenses which compensate the inequality in the curvature.
presbyopia difficulty in focusing for near or close vision due to decreasing of elasticity of the lens. can be tested by near point of accommodation.
visual acuity sharpness of vision. can be tested with a Snellen eyes chart
In farsightedness the light is focus_______ the retin Behind
the lens required to treat myopia is a_______lens concave lens
The "near point" increase with age because the ________ elasticity
A convex lens, like that of the eyes produces an image that is upside down and reversed from left to right. Such an image is called a________image real
during distance vision, the ciliary muscle is______, the ciliary zonule is_____, the convexity of the lens is_____and light refraction is _______ decreased, taut,relaxed, relaxed
During close vision, the ciliary muscle is _______, the ciliary zonule is ________, lens convexity is _____, and light refraction is ________ contracted, relaxed, increased, increased
external ear consists of auricle (pinna), external acoustic meatus,stapes
structure composing the internal ear cochlea, semicircular canal,vestibule
contains receptor for the sense of balance semicircular canal, tympanic membrane
passage between throat and tympanic cavity pharyngotympanic (auditory) tube
Ear a complex structure containing sensory receptors for hearing and equilibrium.
Created by: katzz



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