Vision & Vision Disorders
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what does ocular mean?
What part of the eye does the opthalmologist care for?
- the whole eye!
- a specialty doctor
What part of the eye does the optometrist care for?
- non-medical doctor
- tests eyes for defective vision only
- prescribes corrective lenses only
What part of the eye does the optician care for?
- They don't care for the eyes.
- they only read prescriptions and make the corrective lenses.
What is binocular vision?
using both eyes together
What is braille?
- A system of 6 embossed dots called cells
- 3 dots length wise (up/down
- 2 dots width wide (left/right)
What is glaucoma?
- eye disease
- increased intra-ocular pressure
Where is the iris, or what is it?
- The circular colored membrane
- behind the cornea
- perforated by the pupil
What are zonular fibers?
- fibers that keep the lens of the eye in place
- contraction and relaxation of the fibers allow accommodations of the lens
What causes jaundice?
excessive bilirubin in the blood.
What are 2 signs of jaundice?
- yellowing of the whites of the eyes
- yellowing of skin
What is myopia?
What is nystagmus?
continual rolling movement of the eyeballs.
What is photophobia?
abnormal intolerance to light
What is astigmatism?
- a defect in the curvature of the eye
- results in blurry vision
What is the retina?
The photosensitive nerve layer of the eyes.
What is retinitis pigmentosa?
- Disease of retinal degeneration
- progressive blindness
- starts with night blindness in adolescence or adult life
What is retinoblastoma?
Tumor of the retina
What is retrolental fibroplasia?
eye disease of premature infants
What is a snellen chart?
visual screening chart used at schools in regular doctor's offices
measures visual acuity at 20' from the chart
What is strabismus?
- lack of coordination of the eye muscles
- characterized by squinting or crosseyedness
What is tracking?
the ability to pick out a word, letter, or group of words on a page
What is visual association?
organizing process where one is able to relate to concepts visually presented
What is visual closure?
can identify a visual stimulus from an incomplete visual presentation
What is visual discrimination?
ability to visually differeniate letters and words
what are visual motor skills?
- ability coordinate vision with body movements
- to complete tasks
what is visual perception?
idenitification, organization, interpretation of visual data through the eyes
What is visual sequential memory?
ability to retain a sequence of what is seen
What is figure ground perception?
ability to distinguish a form or pattern against a distracting background.
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