The operation to correct hyperopia
Hyperopia is a frequent, sometimes unknown (up to 40) and mainly caused by a too "short" look, or a cornea whose power is insufficient for converging enough incident light to the retina (this lack of power of the cornea is related to a defect of Camber: the cornea is too "flat").
The hyperopic eye has a lack of optical power: from light rays from a distant source converge at the back of the retina: the image formed on the retina is thus extended, which explains the feeling blur. The operation to correct hyperopia is therefore increase the optical power of the eye. This can be achieved by various methods which the choice is based on many parameters (age, degree of farsightedness, thickness of the cornea, presence of a cataract, etc.):
Increase in optical power of the cornea
The excimer laser sculpts the front of the cornea in order to increase the curvature (ex:) technique of LASIK hupermetropique(, the PKR)-see profile of ablation for the correction of hyperopia. This technique is particularly suitable for the correction of hypermetropies of less than 6 diopters, in patients including the lens is transparent (absence of cataract). It is performed on an outpatient basis under local anesthesia by drops.
Replacement of the lens by a artificial lens implant
This technique is proposed to strongly farsighted patients, at or above 40, and the achieved hypermetropes of cataract.
The lens is removed (classic cataract operation in) phacoemulsification) and the power of the implant put in replacement of the lens is calculated so that the operated eye is more farsighted)Biometry). In case associate of origin corneal astigmatism, toric implant can be placed. To increase independence to the correction in glasses by correcting distance vision and near vision pose a multifocal implant may also be considered.
The correction of hyperopia by replacement of the lens occurs preferentially in case cataract beginner or proven, or from the sixties. In case of high hyperopia (not operable by LASIK: ex: + 8 D), we can consider the surgery with implant in a patient having reached midlife.
We can also correct hyperopia by adding a positive power implant in the anterior chamber or the posterior Chamber without removing the lens, but these techniques rarely used for the correction of hyperopia. The hyperopic eye is a generally shorter look so small, the volume of the compartments likely to receive an implant (without removal of the lens) is generally incompatible with the addition of a foreign element.