Hypermetropia

Hypermetropia

 The ametropia is hyperopia or refractive condition in which the rays coming from you focus beyond the retina.
A certain degree of hyperopia can be compensated thanks to accommodation.
If the latter in relation to the amount of hyperopia is not enough positive lenses will be needed.

 

 

Cause 

From an optical point of view the eyeball is too short compared to the refractive power. The hyperopic can compensate for his ametropia, but this can only happen for defects entity medium-low. The compensation hyperopia also depends on the degree of accommodation available: it is highest in young age but decreases over the years. This explains why a certain degree of hyperopia is compensated by young people quietly while with advancing age should be corrected with lenses becoming stronger.

 

Rarer causes of hyperopia can be:

  • a reduction of the curvature of the cornea and / or crystalline
  • excessive distance between the lens and cornea
  • absence of the lens.

 

Symptoms

The hyperopic can see objects at infinity only by using the mechanism of accommodation and, for this reason, its ciliary muscle is never completely relaxed. The main symptoms are defined asthenopia (headache, burning, tearing, etc..) And occur especially in near vision, due to the excessive use of accommodation (hyperopia + near vision), such as the studio too. Only in a later stage there is a decline in visual acuity which is manifested in the first near vision then also in distant vision, when the accommodation is no longer able to compensate hypermetropia.

 

Therapy

Depending on the outcome of the tests conducted by a specialist, hyperopia can be corrected with the use of glasses or contact lenses. Furthermore, valid alternative techniques in use today are those surgical: excimer laser (PRK and LASIK) and, in special cases, the conductive keratoplasty, the implantation of phakic lenses and replacement of the lens.