Posts Tagged ‘hyperopia’

Differences between hyperopia and presbyopia

December 6th, 2009

Hyperopia is also known as farsightedness or farsighted eye. It is the opposite eye condition of myopia or nearsightedness. Hyperopia is a defect of vision that has difficulty in focusing on near objects that can see distance objects, or in an extreme situation cause a patient to be unable to focus on object at any distance. When the eyeball of the farsighted patient is too short or when the power of the cornea and lens is insufficient that the lens of the eye cannot become round enough, farsightedness or farsighted eye appears, and the vision will be blurred. People with hyperopia or farsightedness can also suffer ashthenopia, amblyopia, strabismus, accommodative dysfunction and binocular dysfunction.

Hyperopia is often confused with another kind of eye disease — presbyopia, which is also referred to as farsightedness or farsighted eye, since presbyopia just like hyperopia can’t focus on near objects. Their causes are totally different, although their signals may very similar. The causes of hyperopia are typically genetic and involve the eye structure. When the causes of presbyopia are related with a reduced accommodative amplitude by natural aging changes with the crystalline lens.

Hyperopia or farsightedness can be corrected by convex lenses in eyeglasses or contact lenses, which should be provide by an eye doctor (such as ophthalmologists, optometrists, or orthoptists) or opticians, after an eye examination. A few amounts of hyperopia may be left uncorrected. In other conditions, if eyeglasses or contact lenses are not favorable by the patient with farsighted eyes, refractive surgery procedures may be carried out for correcting farsightedness.