48-54 Flashcards
eye focuses images correctly on
the retina
Emmetropia
Distant objects appear blurry
▪ Light from those objects fails to reach the retina and
are focused in front of it
▪ Results from an eyeball that is too long
Myopia (nearsightedness)
Near objects are blurry, whereas distant objects are
clear
▪ Distant objects are focused behind the retina
▪ Results from an eyeball that is too short or from a “lazy
lens”
Hyperopia (farsightedness)
Images are blurry
▪ Results from light focusing as lines, not points, on the
retina because of unequal curvatures of the cornea or
lens
Astigmatism
Convergence: reflexive movement of the eyes medially
when we focus on a close object
▪ Photopupillary reflex: bright light causes pupils to
constrict
Eye reflexes
Ear houses two senses
1.Hearing
2. Equilibrium (balance)
The ear is divided into three areas
- External (outer) ear
- Middle ear
- Internal (inner) ear