Most patients who need corrective lenses suffer from myopia (nearsightedness, hyperopia (farsightedness) or astigmatism.
Understand more about these common conditions:
Understanding refractive Error and the need for corrective lenses
Emmetropia – clear vision without glasses or contacts
Myopia – the eye is longer than normal and people have difficulty seeing things far away (chalkboard or street signs). Some progress with age and some solve itself.
Also known as nearsightedness. Images compare normal vision and someone with myopia.
Correction is usually done using glasses or contact lenses.
Hyperopia – smaller than normal and the eye is shorter causing low vision. Difficulty seeing near objects like reading and computer work.
Solved with eyeglasses, specialized glasses, surgery and contact lenses. Images compare between normal vision and someone nearsighted.
Astigmatism – irregular shape in the eye. Can cause strain, headaches etc and distort vision.
Images show the differences between astigmatism and normal vision. Corrected with glasses, contact lenses or refractive surgery.