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Chapter 11 Special Senses: Eyes and Ears - Coggle Diagram
Chapter 11 Special Senses: Eyes and Ears
Snellen chart
–Measures visual acuity
–Recorded as fraction with 20/20 representing normal vision
Refraction
–Determines refractive error
–Determines corrective lens prescription
Diopter
–Unit of measurement of the lens' refractive power
Cover test
–Determines how eyes work together
–Assesses binocular vision
Visual field testing
–Determines loss in peripheral vision
Ophthalmoscopy
–Use of ophthalmoscope to visually examine fundus of the eye
Dilation
–Artificial enlargement of pupil to examine the interior of the eyes
Mydriatic drugs
–Force eyes to remain dilated in the presence of bright light
lamp ophthalmoscopy
–Focusing the beam of light onto parts of the eye to permit examination of structures at front of the eye such as the cornea, iris, and lens
Fluorescein staining
–Application of fluorescent dye to the surface of the eye via eye drops
–Causes corneal abrasion to appear bright green
Fluorescein angiography
–Radiographic study of blood vessels in the retina after injecting fluorescein dye
PERRLA (Pupils are Equal, Round, Responsive to Light and Accommodation)
–Diagnostic observation
–Abnormality could indicate head injury or damage to the brain
Tonometry
–Measurement of intraocular pressure
–Abnormally high pressure may indicate glaucoma