Vision Lectures Flashcards
accommodation
focusing on far off/near objects by changing how much we bend light rays
refraction
light rays bend to form a sharp image on the retina
refractive errors
mismatch between how much we bend light
the cornea, VH, AH and lens are all transparent to allow light to fall on the ……..
retina
light waves from an object bend at the ……. bend some more at the …….. to form a clear image at the ……….
cornea
lens
retina
when the object gets closer - will the lens become thinner or thicker?
thicker
eye needs more bending power to focus on the object
the …….. is the most powerful bender of light but the …… has the capacity to change its bending power
cornea
lens
what 3 things happen simultaneously to comprise accommodation
lens changes shape (thicker and more spherical)
pupil constricts
eyes converge
myopia
short sightedness
hyperopia
long sightedness
astigmatism
non-spherical curvature of the cornea (or lens)
short sighted means distant objects are
blurred
prebyopia
long sightedness in old people
emmetrope
perfect vision
what is the most common cause of myopia?
the eyeball is too long