Aviation Safety Management 1 - Week 2 Flashcards
The ability to see,
VISION
a clear ‘window’ at the very front
of the eye.
acts as a fixed focusing device.
CORNEA
controls the amount of light that is
allowed to enter the eye.
IRIS AND PUPIL
Its shape is changed by the
muscles (ciliary muscles)
surrounding it which results in
the final focusing adjustment to
place a sharp image onto the
retina.
LENS
The change of shape of the lens is
called ______________
accommodation.
located on the rear wall of the
eyeball
RETINA
Two types of light sensitive cells
that are found in the retina;
rods and
cones.
function in good light, are
capable of detecting fine detail, and
are color sensitive
Cones
cannot detect color. They are
poor at distinguishing fine detail, but
good at detecting movement in the
edge of the visual field
Rods
FACTORS AFFECTING CLARITY OF SIGHT
- Physical imperfections
- ingested foreign substances
- Environmental factors
occurs at the point where the optic
nerve enters the retina (between the rods &
cones).
Blind spots
is caused by
a shorter-than-normal
eyeball which means
that the image is formed
behind the retina .
Hyperopia
is
where the eyeball is
longer than normal,
causing the image to be
formed in front of
the retina
Myopia
VISUAL PROBLEMS
CATARACTS
ASTIGMATISM
GLAUCOMA
MIGRAINE
clouding of the lens usually associated with
aging
Cataracts