26 Lens
- cornea sits on top of pupil
- lens sits behind pupil
- both work together
- elongated fiber cells perform anaerobic metabolism
Accommodation
Pathology
Presbyopia
Refractive errors
- corneal does most of refractions, has to bend lights to set on the retina
- sometimes while growing, corneal curvature isn't grown right
Myopia
- negative lens spreads light out
Hyperopia
Astigmatism
- normal cornea circular
- astigmatism: cornea shaped like football, horizontal focus different from vertical focus
Ectopic Lentis
Cataracts
- RA taking steroids
- Also diabetes and galactose deficiency
- Marfan a risk
Aldose Reductase
- aldose reductase found in lens of eye
- diabetes/galactose problem: lots of conversion to sorbitol/galactitol
- draw in fluid, increase lens osmolarity
Diabetes
Galactose
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