Low order<unk>  (hyperopia, Myopia and regular astigmatism), are correctable by eyeglasses, soft contact lenses and refractive surgery. Neither spectacles nor soft contact lenses nor routine keratorefractive surgery adequately corrects high order<unk> . Significant high order<unk> usually requires a rigid gas-permeable contact lens for optimal visual rehabilitation. Customized Wavefront-guided refractive corneal laser treatments are designed to reduce existing<unk>  and to help prevent the creation of new<unk> . The wavefront map of the eye may be transferred to a Lasik system and enable the surgeon to treat the<unk>  Perfect alignment of the treatment and the pupil on which the Wavefront is measured is required, which is usually achieved through iris feature detection. An efficient eye tracking system and small spot size laser is necessary for treatment . Wavefront customization of ablation increases the depth of ablation because additional corneal tissue must be ablated to compensate for the high order<unk> . Actual results with Wavefront guided LASIK showed that not only it cannot remove HOA but also the optical<unk>  are increased. However, the amount of increase in<unk>  are less than conventional Lasik. Corneal optical<unk>  after photorefractive keratectomy with a larger ablation zone and a transition zone are less pronounced and more physiologic than those associated with first-generation (5 mm) ablations with no transition zone. An upcoming systematic review will seek to compare the safety and effectiveness of wavefront excimer laser refractive surgery with conventional excimer laser refractive surgery, and will measure differences in residual higher order<unk>  between the two procedures. Aspherical intraocular lenses (IOLs) have been used clinically to compensate for positive corneal spherical<unk> . Although Aspherical IOLs may give better contrast sensitivity, it is doubtful, whether they have a beneficial effect on distance visual acuity. Conventional (not Aspherical) IOLs give better depth of focus and better near vision. The reason for improved depth of focus in conventional lenses is linked to residual spherical<unk>  The small improvement in depth of focus with the conventional IOLs enhances uncorrected near vision and contribute to reading ability. Wavefront customized lenses can be used in eyeglasses. Based on Wavefront map of the eye and with the use of laser a lens is shaped to compensate for the<unk>  and then put in the eyeglasses. Ultraviolet Laser can alter the refractive index of curtain lens materials such as epoxy polymer on a point by point basis in order to generate the desired refractive profile. Wavefront customized contact lenses can theoretically correct HOA. The rotation and decentration reduces the predictability of this method.
Aberrations of the eye
Optic neuropathy
Retinal haemorrhage
Vitreoretinopathy
Eye neoplasm
Eye disease
Intraocular hemorrhage
Auditory neuropathy