The Crystalens is a cataract implant that is “accommodative”. This unique feature provides after-cataract patients with clear distance vision without glasses, as well as a range of near vision without reading glasses.
As the eye ages, the lens inside the eye loses flexibility, or the ability to “accommodate”, so that focusing on near targets, such as newspaper print, becomes impossible. This is why as people get older they rely on reading glasses for near vision. After cataract surgery, a traditional implant is inflexible, much like a cataract lens, so that an after-cataract patient is still dependent on glasses for reading.
The Crystalens most simulates the lens of a young person. Its design, position, and flexibility provide movement, which allows for clear distance vision as well as a range of near vision without glasses. This remarkable technology was FDA approved in 2003, and has evolved since for improved near vision.
The Tecnis Multifocal and Restor cataract lens implants are after-cataract implants whose aim is to achieve clear distance as well as near vision without glasses. They are examples of multifocal presbyopic implants. Most patients who have cataract surgery with a multifocal implant enjoy spectacle free vision after surgery. By comparision, with a standard monofocal implant, a patient who has clear distance vision will need glasses for near work.
Multifocal implants use the brain’s natural ability to focus on one image while suppressing another to achieve clear vision at all distances. The brain can attend to one image (a cinema screen, for example), while ignoring another image (the back of fellow cinema goers’ heads). A multifocal implant utilizes this ability by providing multiple images and allowing the brain to attend to one and suppress the others.
Concentric rings of various focusing power on the Tecnis Multifocal and Restore implants focus light onto the retina from different distances. Stronger power rings on the implant with focus near images clearly onto the retina, such as for reading or sewing. Weaker power rings on the implant focus far images clearly onto the retina, such as for driving or watching television. The brain then attends to the image of interest while suppressing the rest.
Your Nashua Eye cataract surgeon can help decide if a multifocal lens is right for you. Patients who are the best candidates for multifocal implants have cataracts with otherwise healthy eyes and a lifestyle that majorly includes near vision tasks such as reading or computer.
Toric cataract implants are new technology which allow patients who have astigmatism to see clearly without glasses after cataract surgery. Astigmatism is a common focusing error where the cornea is shaped somewhat more like a football, than perfectly round like a basketball. Most patients with astigmatism depend on glasses or contact lenses to see clearly.
Traditional cataract implants correct for nearsightedness or farsightedness. However, they do not correct for astigmatism. Patients who have astigmatism and have cataract surgery with a traditional implant are dependent on glasses after surgery for clear vision. A toric implant corrects for nearsightedness, farsightedness, and astigmatism, reducing the need for glasses after surgery.
Toric implants are comprised of the same material and have the same excellent safety record as traditional implants. The surgery is performed generally the same way as any cataract surgery; with the exception that special attention is paid to the orientation of the implant to treat the astigmatism. The precise implant shape and accurate surgical placement provides excellent post operative vision without glasses or contact lenses.