Chapter 8 Part 1 (Eye and Vision) Flashcards
What is the conjunctiva of the eye?
A protective mucous membrane lining the eyelids
What is the function if the lacrimal apparatus?
Drain tears into the nasal cavity
The eyes outer most layer is the ____ and it consists the ____?
- Fibrous layer
- Sclera and cornea
The eyes middle layer is the ____ and it consists of the ____?
- Vascular layer
- Choroid, ciliary body and iris
The eyes innermost layer is the ____?
- Sensory layer
What is cataracts?
Partial or Complete lass off transparency of the crystalline lens of the eye
What is glaucoma?
Abnormal increase of the pressure within the eye causing damage to the optic nerve resulting in vison loss
What is refraction?
Bending of light
What is accommodation?
Changes in eye optical power to maintain a clear image or focus on an object as its distance varies
What is the cause of astigmatism?
Occurs when either the front surface of the eye (cornea) or the lens inside the eye has mismatched curves.
What is emmetropia?
To naturally have perfect vision (20/20)
What causes hyperopia?
When your eyeball grows too short from front to back, or when there are problems with the shape of your cornea. (Farsightedness)
What causes myopia?
When your eyeball is too long or the cornea or the protective outer layer of your eye is too curved (Nearsightedness)
What is the photopupillary reflex?
Protective reflex that constricts the pupil upon exposure to bright light to prevent damage to the photoreceptors
What is convergence?
Reflexive movement of the eyes medially when we view close objects
