CATARACT SURGERY AND TARGETING DIFFERENCE VISUAL ZONES
Posted , 5 users are following.
Any ophthalmologist on here. Doing blended vision with monofocal iols.
Can the near eye at -2 target both near & near intermediate vision in that one eye and the distance eye targets intermediate. OR
Can only do near & second eye near intermediate up to I guess that means 24 or so inches.
.
Is it even possible that a -2 target near with an eye that has no other eye disease can end up seeing smaller than 11 or 12 pt font or only way to get smaller font you would need a -2.25 or -2.50. (Not sure if eye prescription enters into this but it is -2.50. Minor astigmatism but would be removed with cataract removed)
If someone gets intermediate vision lets say see up to 24 inches but the reading sweet spot is 14 inches would I see what I am writing at 24 inches or how does that work in the intermediate zone as far as seeing things with print.
How far can a near eye see after cataract surgery. Can you actually get a foot or more of clear vision past the 16 inches or so.
Lets say sweet spot after cataract surgery is 14 inches to read. Does that mean to see myself clearly in mirror I cannot be more than 14 inches closer or reading vision is not relevant to objects in field. Does the IOL prescription dictate anything- Again if -2.00 .
Need clarity of reading in zones vs. seeing objects in a zone. How does that work.
Does -1.25 mean this is a reading target or this is intermediate target or distance?
How can this be set up if someone want to see near and read most size font and get atleast computer vision and as much distance as possible.
0 likes, 4 replies
RonAKA loveanimals
Edited
If you can still see reasonably well, my suggestion would be to use contacts to simulate what you plan to do with an IOL. Then you can come to your own conclusions.
.
I have an IOL for distance that has left me at 0.0 D spherical, and -0.75 cylinder. I can see down to about 18" if it is black normal sized text on a bright white computer screen. In the other eye which is not operated on yet, I use a contact to leave me at about -1.25 D. Together I am eyeglasses free, and can see well down to about 8". For very fine print or in dimmer light I use a pair of +1.25 readers. Probably only put them on once a week or so, for a specific task.
rwbil loveanimals
Edited
On another forum there use to be an Opthmalogist, but they can get in trouble dispensing advice without seeing you.
My advice is if you are thinking of doing this large of monovision is either simulate it first with contacts and if you cannot do that give serious thought to the light adjustable lens. That way if your brain does not adopt you don't have to do a lens exchange and simple just post op change the power level.
I can just tell you I tried monovision along time ago with contacts and HATED IT!!!! I need good distance vision in both eyes. Now in full disclosure I was clueless back then and don't even know what the doctor used. So it might have been full monovision vs micromonvision.
lucy24197 loveanimals
Posted
Part of the problem is that there's so much individual variation in how a particular lens/target works with your eye. I had my first eye done with a Tecnis monofocal almost 4 weeks ago. My "distance" eye target was -0.5. The week after surgery the optometrist said I'd ended up between -0.5 and -0.25 with no astigmatism. Based on the Snellen charts I've got taped to the wall, I'd agree with him and say that's probably still the case. I've printed out a Jaegar chart, and at 14" I can read the #11 line (but it's blurry) and the #10 line I can kind of make out but I'm making guesses as to what the characters are. If I back away to 35-ish inches (it varies between 30-40 inches depending on how my eye is behaving) all the text becomes clear, but most of it is too small to read. I'd have to hold reading material with my toes. So basically with my -0.5 lens I'm losing almost all ability to read at -1.0 D for text on paper. My eyes are still having some blurriness from healing/drops/contrariness, so I'm hoping it will improve a little but not expecting much. I can see things much more clearly on the computer with black text on a white background. The distance is the same for the text to be "sharp", but I can make out characters up to a few inches away. (I do have my text size turned up right now.) When I reduce the text size to a more normal setting, I need to be about 25" away to read it.
I wasn't able to try contacts because my cataracts were too bad, but it's an excellent suggestion.
Regarding the mirror--we were talking about that just last night. You have to be back from the mirror about 1/2 of your focal distance, so if your eye sees things in focus at 22" you only have to be 11" from the mirror (assuming a flat mirror.)
RonAKA lucy24197
Edited
I have not checked my reading for some time. It is almost a year since my surgery on one eye that resulted in 0.0 D spherical and -0.75 cylinder residual after surgery. In bright sunlight I can read the #3 (0.62M) paragraph at 14" if I concentrate. #2 is not possible. #4 is relatively easy. With my natural eye which has a mild cataract and a contact lens to leave me at about -1.25 D I can easily read the #1 paragraph.
.
People seem to differ in what they achieve with a distance IOL. I suspect I am gaining a little with the astigmatism. Perhaps our eyes differ on how small the pupil can go as well - pinhole effect. I am 72 and have probably lost almost all my accommodation ability, but I may have a bit remaining, which would help also. I will lose this when I go to an IOL implant. All of this points to using a plan rather than a single decision when it comes to deciding a course of action. For example do one eye first for distance, ideally the dominant eye, then wait 6 weeks to see what you actually get before deciding on the second eye.