II. Epidemiology
- Most common Refractive Error
III. Causes
-
Autosomal Dominant inheritance
- Mild Myopia (-0.5 to -2.0 D) by age 5 to 8 years
- Moderate Myopia (-2.0 to -5.0 D) by age 8-14
- Severe Myopia (<-6.0 D) by age 20 to 28 years
- Environmental Cause (Prolonged reading, close work)
- Mild Myopia (-0.5 to -2.0 D) by age 8-14 years
- Moderate Myopia (-2.0 to -5.0 D) by age 20-28
IV. Pathophysiology
- Light rays focus in front of Cornea
- Cornea too curved or lens too powerful for globe
- Distant objects not seen clearly
- Correction: Concave lenses (divergent, minus power)
- Degrees of Refractive Error
- Mild Myopia (>-1.5 Diopters)
- Moderate Myopia (-1.5 to -6.0 Diopters)
- High Myopia (<-6 Diopters)
- Severe Myopia (<-8 Diopters) associated conditions
V. Management
- See Refractive Error