Illustration
1. Side view of the eyeball behind the eyelids. 2
2. Front view of the eyeball. 2
3. The eyeball sits in the orbit and has eye muscles
attached to it. 11
4. The visual pathway connects the eyeballs to the brain. 11
5. Top: normal eye. Center: light focuses too far forward in
nearsighted eye. Right: light focuses too far back in
farsighted eye. 19
6. The lens accommodates, or changes shape, to help the eye
focus. 23
7. Top left: single-vision glasses lens. Top right: bifocal glasses
lens. Bottom left: trifocal glasses lens. Bottom right:
progressive glasses lens. 28
8. A flap is made in the cornea during lasik surgery. 33
9. Tears flow from the lacrimal gland, lubricate the surface of
the eyeball, and drain through the tear ducts and lacrimal
sac into the nose. 42
10. Corneal transplant. 64
11. Left: normal lens. Right: cataract lens. 67
12. Instrument placed in eyeball for cataract surgery. 69
13. Left: normal Amsler grid. Center: distorted Amsler grid.
Right: blind spot in center of Amsler grid. 76
14. Left: normal retina. Right: retina affected by diabetic
retinopathy. 81
15. Some retinal surgeries require the patient to be positioned
face down for several days afterward. 88
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