In reference with Presbyopia Correcting Implants it is undoubtedly acceptable to ophthalmologists that prolonged depth of focus lenses have actually increased interest in presbyopia-correcting lenses for surgeons as well as patients. As this topic relates, these implants provide an extended focal range rather than 2 unique focal points as in a multifocal lens. Although optically the Tecnis Symfony uses a unique
system, functionally the Tecnis Symfony works likewise to a low add multifocal in offering patients distance as well as intermediate vision
However like any type of lens that prolongs beyond a single focal point, the EDOF Symfony does have its constraints. Despite an ideal emmetropic result, a couple of patients complained about “spiderweb” glare, specifically while driving at night. These complaints become much more common when there is residual refractive error. These implants are certainly much more flexible of residual refractive error than conventional high add multi-focals, however, Doctors have actually learned to avoid doing mini-
monovision with them due to these undesirable visual phenomena.
Around 60% of cataract patients choose presbyopia-correcting lenses, and here’s an approach the eye surgeons actually found to be extremely rational based on data from several research studies they have actually performed on patient satisfaction.
Initially, allow presume that we’ll just talk about patients who are good prospects for a multifocal or EDOF lens. They have healthy and balanced maculas, controllable completely dry eye as well as fairly aberration-free corneas.
For patients who prefer distance and also intermediate (but not near) vision and if they have low astigmatism, the Symfony lens is a perfect option. It has high refractive accuracy as well as rare issues with undesirable visual phenomena. Various other practical options for this patient are bilateral ReSTOR ActiveFocus 2.5 lens (Alcon) or Crystalens (Bausch + Lomb), targeting emmetropia with all of the above.
If a patient has astigmatism more than 0.5 D and also desires distance and intermediate vision, the Symfony toric as well as various other Tecnis mono-focal and also multifocal lenses do not have rotational stability for doctors to be entirely confident in them. Instead, the doctor should certainly choose a ReSTOR ActiveFocus 2.5 toric or Trulign (the toric version of Crystalens) for both eyes, again
targeting emmetropia. The ActiveFocus lens yields the least complaints of glare and also halos of any type of multifocal I have actually worked with and has exceptional rotational stability in its toric form. For patients who prefer distance, intermediate as well as near, I do not recommend targeting a mini-mono-vision with an EDOF Symfony lens. A lot of these patients do not tolerate the spider-webs in the non-dominant, near eye. Rather, these patients will certainly do well with a ReSTOR ActiveFocus 2.5 in
the leading as well as a +3.0 ReSTOR in the non-dominant eye. With low astigmatism, it likewise makes sense to do this with a Tecnis multifocal 2.5/3.25 also, once again for patients with low astigmatism.