Intermediate distance with a Monofocal?
Posted , 8 users are following.
Two weeks after surgery with a Clareon Monofocal IOL (refractive target was set to -0.5D, don't know the actual refr. results yet).
I have better vision at far distance than before, but anything closer than ~7 feet is pretty bad.
I expected that I would need readers to see my phone and probably for work on the computer at around 3 feet, but hoped beyond arm length things would already come into focus. Moreso, given that my refractive target was set to slight myopia.
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Any hopes this will get better with time, or is this at two weeks as good as it gets?
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Also, what strikes me as odd - when I tried some +1D readers that I had lying around, I was already able to read rather comfortably, while I was told I would need +2.5D readers. This normal?
0 likes, 6 replies
soks BrianCyberEyes
Posted
i have a symfony so this wont help you much but here goes. +0.5 readers do not make any noticeable improvement to near vision.
reading comfort at +1.25 and +1.5 readers
hd vision on phone with +2.5 readers
RonAKA BrianCyberEyes
Edited
My thoughts are based on personal experience is that 95% of the outcome is achieved after 3 weeks, and probably close to 100% at 6 weeks. With my first eye I ended up with an eyeglass refraction of 0.00 D sphere, and -0.75 D cylinder. I can focus down to about 18-20" on computer screen with normal sized print. This seems to be closer than most get. I see others reporting about 24-36" for close focus, but I don't know what their eyeglass refraction is. Keep in mind that the target is a target. You don't know what you got until it is measured.
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As far as readers go, I find +1.25 D work well for me. +2.5 seem like magnifying glasses and make me dizzy when I look up across the room. That said with progressives it seems I always get a +2.5 add no matter what my prescription is for distance.
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Now that my second eye has been done at -1.25 D (autorefraction) I no longer use my progressives however. I just go without glasses and occasionally use of the +1.25 D readers when at home and doing really close work, or for extra small print.
lucy24197 BrianCyberEyes
Edited
Hi Brian,
The focal distance for a -0.5D monofocal is 79", so if you're close to the -0.5D target and don't have significant astigmatism you should end up with some decent vision closer than 7 feet. How much varies greatly from person to person.
I have a Tecnis Monofocal set at -0.5D (surgery about 7 months ago. The other eye is set closer for mini-monovision.) I had some complications so my vision isn't completely stable, but I start loosing sharp focus on my -0.5D eye when things are nearer than about 41". I haven't had my "final" measurement with my eyes fully healed and stable, but for the first couple of months after the surgery the optometrist said I was spot on for -0.5D with no astigmatism. I can't read my electric bill with that eye at arm's length. With +1.0 readers on, the text get clear at a little over 20"; anything closer is blurry. Through my husband's bifocals (we think they're +2.5) text is sharp and crisp at a "comfortable" reading distance--guessing around 14".
I looked at some defocus curves for Alcon Acrysof lenses prior to my surgery, and it looked like on average people in the studies with healthy eyes had 20/20-ish vision down to about 40" with a -0.5 target. (This is a ballpark guess on my part based on estimating values from a curve.)
2 weeks is pretty soon after surgery; there is a lot of healing yet to do. It seems like my near vision was worse at first and got a little better with time, but my vision went wonky a couple days after surgery due to swelling so it's not a good comparison. Wouldn't hurt to ask your doctor about it--you probably have a follow-up appointment soon.
indygeo BrianCyberEyes
Posted
Hi BrianCE,
I have one eye with a monofocal lens set for plano (emmetropia) a few years ago. I'm looking to get the second eye done soon as it's been deteriorating. My existing lens is a Zeiss CT Lucia 611P and, for me, things get blurry within about 20 inches (similar to RonAKA). 20 inches (i.e. not quite my arms' length) and beyond are acceptably sharp.
It could be your refractive target was not hit. In that case, it may be possible to have a LASIK treatment to correct it. You'll have to speak to your clinic about that though. I hope this helps.
IndyGeo
Night-Hawk BrianCyberEyes
Edited
Depends on at what distance, the background lighting conditions, text size, etc. regarding when you say you are able to read "comfortably" with +1D reading glasses.
I have a Tecnic monofocal IOL in my right eye and it ended up at +0.25D with -0.75D cylinder. If I use my +1.0D prescription glasses (it also corrects my small astigmatism left in that eye) I can read my smartphone OK from 18-24" or so. I normally use these +1.0D glasses for intermediate vision at the computer which has a 27" screen about 30" or so away.
But for very tiny text especially without bright lighting I need stronger reading glasses like +2.0D. In bright lighting like outdoors in the sun though I can read a book even without glasses.
john20510 BrianCyberEyes
Posted
What about Eyhance, its a monofocal thats supposed to give you some intermediate