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Visual & Auditory
CMA110
Term | Definition |
---|---|
Visual Acuity | Acuteness or sharpness of vision |
Refraction | Bending of the parallel light rays coming into the eye so they can be focused on the retina |
Errors of Refraction | Most common caused of defects in visual acuity ( caused by abnormal eyeball shape: long and squished) Most vision problems are due to this. |
Myopia | AKA nearsighted. Eyeball elongated from front to back |
Hyperopia | AKA farsighted. Eyeball to short from front to back |
Presbyopia | Decrease in elasticity of lens. Usually begins after age 40. |
Ophthalmologist | Physician that performs eye surgery |
Optometrist | Physician that can measure visual acuity and prescribing corrective lenses |
Optician | Professional who interprets and fills prescription for eyeglasses and contact lenses |
Distance Visual Acuity (DVA) | Used to diagnose myopia. |
Snellen Chart | Used to measure "distance" visual acuity. |
What's the Recommended Age for an Eye Exam? | 3 years old |
How Often Should a Person Get an Eye Exam? | Every 2-3 years. |
What is Used to Measure Near Visual Acuity? | Jaeger Card |
Ishihara Test | Used for color vision test. |
Conductive Hearing Loss | Physical interference with normal conduction (transmission) of sound wave through the external and middle ear. |
Sensorineural Hearing Loss | Damage to the inner ear or auditory nerve. |
Weber Test | Set a tuning fork in vibration placed on center of patient's head. |
Rinne Test | Set tuning fork on vibration place against bone of mastoid process. |
Audiometry/Audiometer | Instrument that quantitatively measures the various frequency of sound waves. |
Tympanometry | Process of measuring mobility of the ear drum (helps determine lost of hearing loss) |
20/50 | A person can see at 20 ft when a normal vision person can see at 50ft |
20/10 | A person can see at 20 ft when a normal vision person can see at 10 ft |
Legally Blind | 20/200 |
Mixed Hearing Loss | Combination of both conductive and sensorineural. |