Article on Synergy
Posted , 3 users are following.
Just read an article on Synergy from an Observational study done in Portugal. It shows defocus curve and VA under both photopic and mesopic conditions. And compares the results to other diffractive IOLs.
One of my complaints with my current MF is performance in dim light, so of interest to me was how the Synergy outperformed the Symphony in mesopic conditions.
One can search for:
"Visual outcomes and patient satisfaction
after implantation of a
presbyopia-correcting intraocular lens that
combines extended depth-of-focus and
multifocal profiles"
0 likes, 6 replies
RonAKA rwbil
Posted
It seems to me to be trying to defy the laws of physics to get good vision across the whole distance range without side effects such as loss of visual acuity in lower light, and loss of contrast sensitivity. Seems to me that the lens is forced to split the light into the different ranges and you cannot get full available light at any single distance. And similar with the contrast sensitivity. Seems that the main factor that reduces contrast sensitivity is the presence of other out of focus images around the in focus image. This has to reduce sharpness and the contrast.
soks RonAKA
Posted
i think that is edof's mechanism that synergy has adopted. however rwbil has a bifocal so his mesopic performance should be better than trifocals?
rwbil RonAKA
Posted
I think the goal is to compare contrast sensitivity and mesopic VA to other diffractive IOLs. A Monofocal IOL, in general, will be superior.
It would be great to see a "TRUE" simulator showing images that showed contrast loss across various IOLs. But I don't even think the Tecnis simulator showing halos and dim light is accurate. In fact when I looked at it the image looked brighter at night due to the halos.
rwbil soks
Posted
God I hope not! I would think the same thing, but from what I read "Supposedly" the Synergy IOL is better in dim light than a MF, due to advancements in technology. Is that true; I have no idea. And sadly will not know until I get the Synergy and compare. As I doubt anyone is going to pay to do a detail clinical trial comparing the Tecnis Synergy to the Tecnis MF. Instead already see and expect to see more and more manufacture sponsored studies comparing Synergy to PanOptics.
RonAKA rwbil
Posted
There is a article which compares the properties of multifocal lenses. See table 1. They give a light distribution to the various ranges. The Alcon Restore is said to be 50/50 for near and far. The PanOptix is 44/22/22. There is another lens which I am not familiar with called the SeeLens MF. It shows 65/35 to near/far. The article predates the Synergy lens, so no numbers on it.
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PMC5747227 Multifocal intraocular lenses: Types, outcomes, complications and how to solve them
soks rwbil
Posted
as PCO increases symfony's mesopoc performance improves.