4540153
Description
Mind Map by Jack Willepotte, updated more than 1 year ago
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Created by Jack Willepotte
almost 9 years ago
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THE EYE
- focusing an object
- the eye's able to focus on objects
between the near point and far point
the near point of a human eye is
25cm and the far point is infinity
- when focussing on close objects the
ciliary muscles contract and the lens
becomes thicker causing greater
refraction of the light
- when focussing on a distant object the
ciliary muscles relax and the lens becomes
thinner causing less refraction of the light
- when focussing on a distant object the
ciliary muscles relax and the lens becomes
thinner causing less refraction of the light
- when focussing on close objects the
ciliary muscles contract and the lens
becomes thicker causing greater
refraction of the light
- the eye's able to focus on objects
between the near point and far point
the near point of a human eye is
25cm and the far point is infinity
- Structure of the eye
- light enters the eye through
the transparent cornea
which refracts light
- the light then passes
through the pupil (gap in
the iris)
- the iris can change the size
of the pupil to decide the
amount of light entering
the eye
- the lens then further
refracts the light so that
it's focussed on the retina
- the retina then detects the
light and sends signals
down the optic nerve to be
interpreted by the brain
- a camera works
similarly, see "visible
light" mindmap
- a camera works
similarly, see "visible
light" mindmap
- the retina then detects the
light and sends signals
down the optic nerve to be
interpreted by the brain
- the lens then further
refracts the light so that
it's focussed on the retina
- the iris can change the size
of the pupil to decide the
amount of light entering
the eye
- the light then passes
through the pupil (gap in
the iris)
- light enters the eye through
the transparent cornea
which refracts light
- Eye defects
- short sightedness: can be caused
by the eyeball being to long or
the lens being unable to focus
short sighted people are unable
to focus on distant objects
- Long sightedness: can be caused by the
eyeball being too short or lens being
unable to focus long sighted people are
unable to focus on near objects
- long and short sightedness
can be treated by.......
- glasses and contact lenses: the
artificial lenses refract the light
before it enters the eye causing light
to be focussed on the retina
- Laser surgery: the laser re-shapes
the cornea causing the light entering
the eye to refract differently
focussing it onto the retina
- glasses and contact lenses: the
artificial lenses refract the light
before it enters the eye causing light
to be focussed on the retina
- short sightedness: can be caused
by the eyeball being to long or
the lens being unable to focus
short sighted people are unable
to focus on distant objects
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