If during your assessment for laser vision correction, you are found to have a cataract, your surgeon may advise you to undergo cataract surgery instead. Depending on your needs he may offer one of the following.
If you have presbyopia (problems with near vision due to old age), you may benefit from a multifocal lens implant. These lens help patients to see near and far objects without the need for reading glasses. However, there are compromises such as reduce contrast and glare and haloes at night which the patient has to contend with. Some lenses also are not as good for seeing objects of intermediate distance. Patients may still require the use of reading glasses for intensive near work like reading a book.
This is another solution for those with presbyopia just as in LASIK and PRK, monovision is the technique that corrects one eye for distant vision and the other for near vision. The difference between the two eyes is kept within 150 degrees so that the eyes can still work together. Aspheric lens implants can be used to increase depth and focus and improve the blending of vision between the 2 eyes.
Aspheric lens implants can help to correct patients with a significant cornea spherical aberration to improve the depth of focus and quality of vision. Spherical aberration naturally occurs in the eye and reduces the sharpness of images when light rays from the periphery of the cornea which is too high in power reach the retina slightly off focus. Your ophththalmologist will need to assess which aspheric implant you is most suited for.
This is a lens implant that may be useful for those whose corneas have a significant degree of astigmatism. The lens has built-in astigmatic correction.