Page 14 - SELF-PACED LEARNING MODULES

Sense of sight: The eye The visual
accessory organs
include the
eyebrows, eyelids,
eyelashes, lacrimal
apparatus, and
extrinsic eye
Iris: colored part of the eye muscles.
The eyeball has
Pupil: regulates the amount of three layers:
light that enters the eye sclera,( white of
the eye) choroid
Optic disc: blind spot of the eye ( contain blood
vessels) and retina
(contains the
photoreceptors,
rods, and cones)
There are two set
of eye muscles:
extrinsic and
intrinsic muscles.
Extrinsic, move
eye ball
Intrinsic, move the
pupil and change
the shape of the
lens for refraction.
Light stimulates
the
photoreceptors.
cones): react to
bright light.(day
vision)
Rods sensitive to
dim light.(night
vision)
Hyperopia
Hyperopia.-
Focusing takes
place after the
retina.

Myopia
Myopia. focusing
takes place in
front of the retina