|
Crystalens |
ReZoom |
ReStor |
Human Optic |
Tecnis |
Tetraflex |
|
|
|
|
|
|
|
|
Zoom Lens |
Multifocal Lens |
Bifocal Lens |
Zoom Lens |
1.Multifocal
2.Aspheric |
Zoom Lens |
Focusing Mechanism |
Implant moves back and forth (autofocuses), powered by eye muscles |
Light focused simultaneously through three zones for far, arm's length, and near vision |
Light focused through 'apodized' portion of lens, giving far and near focusing |
Implant moves back and forth (autofocuses), powered by eye muscles |
Designed for improved contrast vision in low light |
Implant moves back and forth (autofocuses), powered by eye muscles |
Distance vision (road signs, TV captions) |
+ + |
+ + + |
+ + + |
+ + |
+ + + |
+ + |
Arm's length vision at 2-3 feet (computer screen) |
+ + |
+ + |
+ / - |
+ + + |
+ + |
+ |
Near Vision at 1-2 feet |
+ |
+ + |
+ + + |
+ + |
+ + + |
+ |
How quickly Will I have Clear Vision For… |
Far away |
Immediate |
Immediate |
Immediate |
Immediate |
Immediate |
Immediate |
Arm's length (2-3 feet) |
Slowly improves over one to several weeks |
One month |
May take up to 3 months |
Slowly improves over several weeks |
One month |
One month |
Up close (1-2 feet |
Slowly improves over one to several weeks. Average 4 weeks |
One Month |
Immediate |
Slowly improves over one to several weeks Average 4 weeks |
One Month |
Slowly improves one to several weeks. Average 4 weeks |
Advantages |
True accommodating lens. Theoretically best clarity of vision at all distances |
Excellent results for distance and arm's length |
Best for fine print. Results are immediate |
Increased comfort level. Can provide a better quality of vision for daily activities |
Provides high quality high contrast distance and near vision day/night |
Designed to permanently provide excellent distance, intermediate vision along with useful near vision |
Disadvantages |
Some “learning curve,” in re-training muscles to focus. May need glasses for some fine print |
May get glare and 15% get halos when driving at night. May need glasses for some fine print |
May get glare and 10% get halos when driving at night. Limited arms length vision. Some loss of contrast |
May require reading glasses if hinge failure occurs. No evidence of this yet |
May get glare and 15% get halos when driving at night. May need glasses for some fine print |
May need some degree of monovision to achieve best binocular performance. |
Ideal Candidate |
Active, young people who may not mind glasses for very fine print and need clear vision for driving at night |
People who do not drive at night or not bothered by glare or loss of contrast. |
People who do not drive at night, not bothered by glare or wearing glasses for computer |
Active people who may not mind glasses for near vision if hinge failure occurs |
People with no ocular pathology .Need clearer vision at night e.g. photographers with positive corneal asphericity |
Patients with low expectations. People who are long sighted or have normal vision |
