Chapter 13: Pathology of the Eye Flashcards
Cycloplegia
Paralysis of the ciliary body: this affects changing the shape of teh lens to bring images into focus
Diplopia
condition of seeing double
Iridoplegia
Paralysis of the iris: this affects changing the size of the pupil to regulate the amount of light entering the eye
Nyctalopia
difficulty seeing in dim light; also called night blindness; due to damaged rods
Papilledema
choked disk: result of increased intraocular pressure; swelling of the optic disk
Photophobia
strong sensitivity to bright light
Presbyopia
vision loss due to old age, resulting in difficulty in focusing for near vision (such as reading)
What is Achromatopsia?
Condition of color blindness- unable to perceive one or more colors; more common in males
Monochromatism
unable to perceive one color
What is Amblyopia?
loss of vision not as a result of eye pathology; usually occurs in patients who see two images (diplopia).
in order to see only one image, the brain will no longer recognize the image being sent to it by one of the eyes.
may occur if strabismus is not corrected; lazy eye
Can Amblyopia be treated with prescription lens?
No
What is Hyperopia?
far sightedness; see things in a distance but not up close
What lenses is required for Hyperopia?
Converging or biconvex lenses
What is Myopia?
See up close but distance is blurred; nearsightedness
What lenses is required for myopia?
Diverging or biconcave lenses
What is legally blind?
Severely impaired vision
20/200; cannot be improved with corrective lenses or having a visual field less than 20 degrees
What is Hemianopia?
Loss of vision in half of the visual field
Stroke patient may suffer
What is Astigmatism?
Condition in which light rays are focused unevenly on the retina,, causing a distorted image, due to an abnormal curvature of the cornea