Does farsighted monofocal lens still allow visuals on car dash without glasses?
Posted , 6 users are following.
I'm looking into having cataract removal surgery in the near future for both eyes and was wondering what impact the farsighted monofocal lens would have on dash instrumentaion readings when driving, which includes speedometer, GPS, etc. The idea of having to slip on glasses to handle the intermediate sight zone strikes me as disrupting and even dangerous. Anybody out there in a similar situation that can shed light on this? Thanks!
0 likes, 8 replies
RonAKA rod1105
Edited
The dash distance is kind of in the dividing line zone for what you can see well with a monofocal set for distance. Some see the dash well and some do not. I do see the dash well with my Alcon AcrySof IQ lens, but you can find reports here of others that do not see that close. The typical range of good vision is down to 2 to 3 feet. I am able to see reasonably well down to 18-20" or so, but that seems to be an exception. I am slightly myopic at about -0.4 D in my distance eye, and that is what I get. That is one thing you have to be careful of. You do not want to be left far sighted as that not only impacts distant vision, but it also reduces near vision.
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I used monofocals set to monovision and my near eye ended up at about -1.6 D. I can see my dash with either eye, so the dash instruments are basically in focus with both eyes.
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If you do both eyes for distance and end up not being able to see the dash, then the realistic option for driving is to use progressive eyeglasses. They will correct any residual error in your eyes and also give you the near vision.
rod1105 RonAKA
Posted
Thanks so much for the feedback. I was thinking along the same lines of getting progressive glasses that would be basically non-Rx glass in the main sight zone and nearsighted Rx in the lower portion should my intermediate vision be compromised. I do have Macular Degeneration that's under control so I'll be limited to the monofocal lens as opposed to some of the multizone lens that are available. Got a consult coming up soon so I'm sure I'll learn more details. Thanks again!
RonAKA rod1105
Edited
You could ask about the suitability of mini-monovision in your consult. There are some monofocal lenses like the B+L enVista that claim to give a better depth of focus. Another one would be the J&J Eyhance although it could be questioned whether that is a true monofocal or not. You could ask about those options.
kim79120 rod1105
Posted
I doubt you would be happy....if you go monofocal get EDOF...extended depth of focus...that way you can see the dash of your car....I got the LAL and it has some EDOF but they dont really advertise it....I can so my dash fine....only had one eye done ...originally I got the EYHANCE extended depth of focus and I was super happy...but its started rotating in my eye and since it was a toric that changed my vision...no one could tell it would happen it was just the anatomy of my eye...anyway the dr exchanged it with a LAL and that solved the problem....
RonAKA rod1105
Edited
A conservative and safe way of approaching this is to target distance (-0.25 D) in your dominant eye first to get distance vision with a monofocal. Make sure you schedule your second eye for at least 6 weeks after the first eye. If you get your dash vision you want with your first eye, then just do the same with the second eye. If you don't then target the second eye with a little more myopia in the -0.5 to -0.75 D range based on what you got with the first eye. You get more near vision with a little myopia than you do with a EDOF or near EDOF lens.
lucy24197 rod1105
Posted
My distance eye is at -0.5 D. I can see my speedometer, tach, and gauges with my distance eye well enough for short trips, although they aren't sharp. I cannot read the odometer very well--I can pick out about 1/2 of the numbers. I have analog gauges that are black on white so they have excellent contrast. Not sure how a modern digital display would be. My lenses are set up for minimonovision, so with both eyes there's no problem, but I don't think I'd like to drive without glasses if both eyes were set for distance. I had natural monovision before the cataract surgery and always had the doctor undercorrect my near eye so the dash was sharp. I will probably do the same for my next glasses.
Guest rod1105
Posted
i see the dash great with my Eyhance which was targetted for -0.21 (although according to my optometrist it has shifted to the plus side of plano). But something people often forget a out when discussing focus distance is light. At night it's a different story. Not great. But during the day I see the dash perfectly.
RebDovid rod1105
Posted
My wife, who has Eyhance IOLs targeted at -0.50 D had, when refracted one month after her second eye was done, 20/25 distance vision. She can see well, and without glasses, from distance (including driving at night) to and including her MacBook Air. She uses readers for near vision.