eye Flashcards
what type of organ is the eye?
a sense organ
what are the receptors in the eye sensitive to?
light intensity and colour
what is accommodation?
the process of changing the shape of the lens to focus on near or distant objects
what happens to the ciliary muscles to focus on a near object?
they contract
what happens to the suspensory ligaments to focus on near objects?
they loosen
is the lens thinner or thicker when focusing on a near object?
thicker
does the lens only slightly refract light rays or refract light rays strongly when focussing on a near object?
it refracts light rays strongly
what happens to the ciliary muscles when focusing on a distant object?
they relax
what happens to the suspensory ligaments when focussing on a distant object?
they are pulled tight
does the lens get thicker or thinner when focusing on a distant object?
it gets pulled thinner
does the lens only slightly refract light rays or refract light rays strongly when focussing on a near object?
it only slightly refracts light rays
what is myopia?
short sightedness
what is hyperopia?
long sightedness
what do glasses do?
refract the light rays so they focus on the retina
what are the 2 types of contact lenses?
hard and soft
what does laser eye surgery do?
changes the shape of the lens and replacent lenses can be placed in the eye
