Disorders of the eye.

1
Disorders of the eye.

• Astigmatism
• Myopia - nearsightedness
• Hyperopia - farsightedness
• Presbyopia
• Color blindness
• Cataracts
• Glaucoma
• Conjuctivitis

2
Astigmatism

• Distortion of vision due to abnormal curvature of
  the cornea or lens
• Lenses can correct astigmatism

3
Myopia (nearsightedness)

• Common among young people - eyeball grows too
  rapidly during maturation light is focused in
  front of the retina
• Can be corrected with the use of concave lens

4
Hyperopia(farsightedness)

• Light is focused behind the retina
• Eye may be too short
• Can be corrected with a convex lens

5
Presbyopia

• Declining ability to accommodate
• Bifocals
• People who never needed glasses before may need
  convex lenses for reading

6
Color Blindness

• X linked trait most often affects males
• Inability to distinguish between certain colors

7
Cataracts

• Loss of transparency caused when the lens becomes
  cloudy
• More common in older people
• Can be treated with surgery

8
Glaucoma

• Increased pressure on the optic disk due to build
  up of aqueous humor
• This can be treated one of two ways
• Surgery of the Iris
• Drugs that constrict the pupil

9
Conjunctivitis

• May be caused by smoke, dust, chlorine, bacteria,
  and viruses
• Most common in children may be treated with
  antibiotics