Crystalens accommodating iol eye lens accommodating
I'd posted before asking for information about lens options before surgery, but thought I'd start a new thread now that I've gotten the lens where perhaps others can add their results as well with the Symfony lens.It is a new type of "extended depth of focus" lens that uses a different design than multifocal and accommodating lenses.So according to those values, the contacts did give leave that eye around -1.75D myopic (the value at the spectacle plane isn't much different).Refractions aren't exact, and can fluctuate throughout the day and I don't know if your glasses RX wasn't from this optometrist but your doctor perhaps, so I'm suspecting the optometrist gave you -1.5D monovision according to his measurements when you got them.At near my vision was already about 20/25 (but fluctuating a bit it had seemed better earlier that day).Given its improvement since then I'd guess its likely 20/20 or so, I can read the small print on my eye drop bottles for instance.(though there is speculation it may be benefit from some extended depth of focus, which is what the Symfony is designed to use to begin with).I'll continue this in another post in a few minutes.
This issue is that someone with their natural lens still who is presbyopic for instance may be able to theoretically read a particular print size without glasses, but that the muscle effort to focus may be a strain to do for an extended period of time, and the Crystalens at least partly seems to require the same sort of accommodative effort.
The other thing the Symfony does is to correct for "chromatic aberration", an issue which is discussed in this industry publication which quotes one prominent surgeon noting: Cataract surgery with an IOL with an Abbe number greater than that of the natural lens (47) can improve CA, so that our cataract patients could actually experience better vision quality than they did as young adults.
" Although the Symfony uses a high Abbe material (I'm assuming its the same Tecnis material that article lists as having a 55 Abbe), it also has other features to to correct for CA to improve image quality.
page=0,1 "the Symfony IOL might be available in the US by late 2016 or early 2017... from what I’ve heard so far from respected and trusted surgeons, patients implanted with this IOL are seeing 20/20 at distance and intermediate with very usable, J2 or J3 near vision and are not experiencing any loss of contrast or perceptible problems with glare, halos or other dysphotopsias.
So, it looks like they are having their cake and eating it too.” I had considered the option of getting a trifocal lens which targets far, intermediate, and near (also unfortunately not yet available in the US), or even a bifocal with a small add so its focused more at intermediate than near.
There is no perfect lens, so its partly a matter of placing a bet on which might work out well, and I figured that it was better to bet on something that didn't require the accommodation to work (in addition to other concerns regarding problems people have with the Crystalens, though those may be fewer in the newest versions).