Refractive errors

Disease class: Eye diseases

There are four major types of refractive error.

 

Types

• Aniseikonia
• Anisometropia
• Astigmatism: light does not focus evenly on the retina, abnormal corneal curvature or abnormal lens shape.
• Corneal Wavefront Aberration
• Hyperopia: far-sighted
• Myopia: near-sighted
• Presbyopia: age-related, progressive loss of ability to focus vision on close objects.

 

Epidemiology

Presbyopia affects most people over the age of 35, and nearly 100% of people by the ages of 55-65