Cataracts will not cause large vision changes for some people. A cataract at the outer edge of your lens, for example, may hardly affect your vision. A cataract at the center of your lens, may greatly affect your sight.
You should only agree to have surgery when you are unable to do all the things you want to do while wearing your glasses. If you decide to have surgery, you and your eye doctor (for cataract surgery, this will be an ophthalmologist or eye MD), must work together as a team.
An ophthalmologist is a medical doctor who specializes in diseases of the eye. He or she has been trained as an eye surgeon to perform cataract surgery. You and your eye doctor will determine the best treatment for you—the one you are most comfortable with and the one he or she is best at performing. As you read this guide, note any questions or concerns you may have and discuss them with your eye doctor.
Note: If a cataract keeps an eye doctor from viewing the inside of your eye, he or she may suggest surgery. Your eye doctor needs to be able to view the inside of your eye to check for eye diseases such as glaucoma and problems of the retina (the innermost part of the eye containing lightsensitive nerve cells).
During the cataract operation, your surgeon will first remove the clouded lens. (If you are able to have a lens implant, your doctor will perform this procedure right after removing your cataract lens.) There are three methods for removing the clouded lens:
Intraocular lenses (IOLs) replace your cataract, or cloudy lens. If you have certain eye diseases or problems which prevent safe placement of an IOL, you will need either contact lenses or cataract glasses in order to see clearly after surgery. IOLs are the most popular choice for replacing lenses with cataracts. Unlike contact lenses, these lenses are implanted inside the eye and are meant to be permanent and they do not require replacement or cleaning.
The eye surgeon implants the IOL in about the same place as your natural lens, so that it results in the most natural vision. IOLs are the best option to replace your own lenses. However if you have certain other eye diseases or problems, you may not be able to have lens implants. You and your eye doctor will need to discuss whether any restrictions apply.
In order to put in an IOL that exactly fits your eye, your eye doctor will measure the length of your eye before your surgery using a painless sound wave (ultrasound) test to determine what strength you will need for your IOL. Your eye surgeon will also check the health of your retina and cornea and give you an estimate of the level of vision you can expect after surgery.
The IOL may correct nearsightedness or farsightedness so that you may see well without glasses for distance vision. However, after standard IOL implantation, you will still need glasses to read clearly. Currently, there are special “multifocal” IOLs that enable you to see well not only for distance vision but also possibly for reading vision. You and your doctor will need to discuss whether this is an option for you.