Posted , 5 users are following.
Just saw this article in eyewire news, "Alcon Commercially Launches AcrySof IQ VivityExtended Depth of Focus IOL in US"
Passing it along for anyone interested.
0 likes, 6 replies
We want the community to be a useful resource for our users but it is important to remember that the community are not moderated or reviewed by doctors and so you should not rely on opinions or advice given by other users in respect of any healthcare matters. Always speak to your doctor before acting and in cases of emergency seek appropriate medical assistance immediately. Use of the community is subject to our Terms of Use and Privacy Policy and steps will be taken to remove posts identified as being in breach of those terms.
RonAKA rwbil
Posted
This statement from the news release seems a bit questionable.
.
"Alcon has commercially launched the AcrySof IQ Vivity IOL, which the company describes as the first and only non-diffractive extended depth of focus IOL in the United States."
.
I thought that the Tecnis Eyhance was already available in the US? And that it basically uses the same aspheric modification method to "stretch" the point of focus out.
rwbil RonAKA
Posted
Hey, you are not going to let facts get in the way of a good adverting campaign. Actually I believe the Tecnis Eyhance was just FDA approved like a week ago, so maybe they already had that written before hand. Who Knows.
Guest RonAKA
Edited
I believe that in order to qualify as an EDOF lens it must provide at least 1.5 diopers of "accomodative effect". The Vivity does (1.5 diopters). The Eyehance does not (1.3 diopters)
RonAKA Guest
Posted
That is interesting. Your comment prompted me to go back to look at the McCabe presentation on the Vivity. They claim that to be called an EDF IOL it has to meet certain criteria, one of which being a depth of focus of 0.5 D or more than a monofocal. That is where things start to get tricky as a monofocal has nearly 1.5 range of focus already.
.
.
.
That sort of suggests that the Eyhance is fitting into a pretty narrow space between the Vivity and just a plain jane monofocal. In other words slightly better than a monofocal but not enough to be called an EDF IOL.
.
I guess it is dangerous to compare charts from different studies, but if one looks at the defocus curve claimed for the Eyhance compared to a monofocal, and then compare that to the Alcon standard monofocal, at the 0.2 visual acuity level, the Eyhance is really no better than the monofocal. It does appear to be better than the Tecnis monofocal, which in turn is not as good as the Alcon monofocal.
.
.
In other words if these charts are accurate and comparable one can get the same range of focus as an Eyhance with just a standard Alcon monofocal. I wonder if this is due to the difference in approach of the two manufacturers to asphericity? The standard monofocal Tecnis uses a SA of -0.27 in their aspheric lens, while Alcon uses -0.20 which does not fully correct the average +0.27. This would seem to make some sense as I believe both the Eyhance and Vivity modify asphericity to gain EDF.
.
Now after I look at this more closely I see that the Vivity cuves are based on binocular vision, while the Eyhance curve is monocular. Perhaps that is the real difference...
soks rwbil
Posted
i think vivity and eyhance calling themselves edof is a bit misleading. i read an article where they said even the lara was more with a multifocal with a near add making symfony the only true edof.
RonAKA rwbil
Edited
I came across a couple of interesting defocus graphs in the Vivity Package Insert. What they show is that people with small (<3 mm) pupils get significantly better close vision with the Vivity than those with large (>4 mm) pupils. This suggests that older people which typically have smaller pupils may have better results than young people using this lens. This may explain some of the different opinions people have of these lenses. See the defocus graphs below. The difference between the pupil sizes are much less on the monofocal lenses.
.