In my previous post I summarized the results of a study performed by Dr. William Trattler and associates. Today I would like to dig a little deeper into the “real-life” experience of surgeons who use these lenses. In order to make this post as useful as possible to my readers, I am not just going to relate my own experience. Rather, I have chosen to relate the experience of another well-respected Los Angeles cataract surgeon (on the “other side of town” – the Westside).
Like Dr. Trattler, Dr. Uday Devgan is a paid consultant of AMO. Also like Dr. Trattler, I respect his opinion and have chosen (with his permission) to relay it to you:
ReStor® +3 (SN6AD1)
- This IOL has a +3 add on anterior (front) surface of the IOL. This translates to about +2.25 at spectacle plane (what would be placed in bifocal glasses). In other words, the strength of this IOL is intermediate vision (computer use, arms-length work, shopping).
- Diffractive rings are located in the central 3mm of the optic. This makes the IOL “pupil dependent”. In other words, the IOL is distance dominant for larger pupils and near dominant with small pupils. What does this mean? Practically, it means that there should be good night-time vision with minimal halos noted (though they will be there, most people do not find them too bothersome); and that reading will require a good source of light in order to keep the pupil small.
- The IOL has ayellow chromophore (tint) intended to protect the retina from “harmful” blue wavelengths of light (note: the benefit/detriment of the filter is controversial)
- Optimal near point of about 17-18 inches (the distance from your eyes at which you can expect to have the best near vision – see above comments about intermediate vision)
Tecnis® Multifocal (ZMB00)
- This IOL has a+4 add on posterior (back) surface of the IOL. This translates to about +3.00 at spectacle plane(what would be placed in bifocal glasses). In other words, the strength of this IOL is near vision (reading books, threading needles, etc.)
- The diffractive rings are located throughout entire optic. This makes the IOL “pupil independent”. In other words, the near and far vision are equally good at all pupil sizes. Practically, this means that it should be easier for patients to read in dim lighting but that halos may be more bothersome with night-time activities such as driving.
- The optic does not have a “blue-blocking” tint. Again, there is controversy regarding whether this is a good or bad thing (see my earlier posts on this topic).
- Optimal near point of about 13-14 inches (near activities)
Dr. Devgan also notes that since the central 1 mm of the Tecnis® Multifocal IOL is pure distance, it tends to give great vision for daytime activities such as golf, daytime driving, etc without any complaints of waxiness.
Dr. Devgan can be reached at:
Devgan Eye Surgery
11600 Wilshire Blvd, Suite 200
Los Angeles, CA 90025