Near vision monofocal with astigmatism
Posted , 7 users are following.
Hello.
I brought up the idea of intermediate vision with my surgeon but he does not recommend it since he said my vision will be fuzzy near and far. He entertained the idea of near vision and he said he can target -2.25 for both eyes. I asked him sbout toric but he said he does not recommend toric if I target near but can use toric on my left eye if I choose distance.
I'm now confused because my prescription says -1.5 OD cylinder and -1.25 OS cylinder. So isn't my right astigmatism worse and why would he recommend it for the left?
Also, any idea why he didnt recommend toric for near vision? I am worried everything will be blurry including near if I dont choose toric.
Lastly, does -2.25 sound like a good target? I think I have given up on monovision since 2 surgeons I saw do not want to recommend it and I am not used to contacts to try it.
Thanks to everyone who have been so helpful!
0 likes, 11 replies
trilemma aspen88
Edited
I agree with you -- both should be toric.
If I were to make what you report he said to make sense, he would assume that you could not swing the extra cost of two torics, and that since you would need glasses for driving and reading, correct the astigmatism in the glasses. But in reality, what you report does not make sense to me.
I like the idea of mini-monovision. I expect to do that when I get my second eye done.
judith93585 aspen88
Edited
It's been my experience that -1.75D (spherical equivalent -1.5) and even -1.0 gives me all the small print reading vision I need, not tiny but I don't need tiny. I should add that the -1.0 lens has not be validated with a refraction but it does provide me with MUCH more functional vision than the -1.5 lens. For what it's worth, my surgeon recommended that both IOLs be toric. By the way, I do have some depth perception issues even with this slight offset and if I had it to do over again, I'd choose -1.0 for both eyes.
aspen88 judith93585
Posted
is -1.0 considered intermediate? Do you wear progressives for distance and close up? Thanks!
judith93585 aspen88
Posted
I've seen -1.0 listed at the top of the intermediate range. I'm waiting for my refraction appt at the end of January and will see what my optomotrist recommends. That said, I don't feel the need for reading or intermediate assistance, so might end up with some sort of bi-focals or distance glasses, especially for driving. My vision indoors is quite clear.
RonAKA aspen88
Edited
-1.0 D provides peak vision at 1 meter or about 3 feet. It provides OK (20/32) down to about 16" and in the distance direction out to about 7 feet. This is kind of a no man's land, as you need glasses to read well, and glasses to see well in the distance to drive.
RonAKA aspen88
Edited
The first issue is that you cannot be sure what your post cataract surgery astigmatism will be based on your eyeglass prescription for cylinder. The reason is that your current cylinder requirements will be the sum of astigmatism in the lens, which may be aggravated by the cataract, plus the astigmatism in the cornea. And they are not purely additive as the angle of each component can be different. So the bottom line is that you will not know what residual astigmatism there will be with the natural lens removed until they have done the detailed eye measurements with instruments like the IOLMaster and Pentacam. You need to ask what the predicted residual will be if you do not get a toric.
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Astigmatism impacts both near and far vision, so that alone can't be a reason not to get a toric. It could be that if measurements have already been taken that your predicted residual cylinder in that eye is less than 0.75 D and a toric is not suitable for that low of an amount. Or, it could be that if you get corrected to -2.25 D you will need glasses anyway. Correcting astigmatism is really only required when you want to be eyeglasses free. Eyeglasses easily correct astigmatism for near and far, and spending money on a toric is kind of a waste if you are going to wear glasses.
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Targeting -2.25 is going to give you very good near vision without glasses IF your predicted astigmatism is less than 0.75 D cylinder. And even if it is larger than 0.75 D vision can be good if you can tolerate some blurriness.
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Do you have any particular activities that you need near vision without glasses? If not, then having -2.25 D near vision may not have much value to you. I was in that range of myopia for 30 years or so, and basically wore progressive from the time I got out of the shower in the morning until the time I went to bed.
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What you need to think about is what vision do you want without glasses on. If it is distance then correct to slight myopia like -0.25 D, and if it is near then correct to -2.25 D.
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Also keep in mind that mini-monovision is not a terrible outcome that cannot be corrected with eyeglasses. It can be perfectly corrected with eyeglasses, just like you would correct both eyes at -2.25, or both eyes at plano. You are not painting yourself into a corner that you cannot get out of. All you are determining is what vision you will have without glasses on. You might be surprised as to how good it is, and spend most of your time without glasses on. The worst case is that you may need glasses. If you target -2.25 D, you WILL require glasses. There is no may about it. And if you target plano in both eyes you WILL need reading glasses or even prescription glasses.
aspen88 RonAKA
Posted
If I target -2.25 wouldn't there be a natural micro minivision since the target isn't almost always exactly met at surgery?
My doctor uses the Lenstar which I think you said takes longer to take measurements. Do you think it is a significant risk? I like this surgeon more than the other 2 I saw that used the IOL master. He said the machine will let them know if the measurement is not good and he assured me it was.
I asked for a copy of the measurement but have not received it yet. will it tell me what the predicted residual astigmatism would be?
Thanks for your help!
RonAKA aspen88
Edited
If both eyes are targeted to -2.25 and both are not right on target, yes they could quite likely come out a bit different. However, there is no real advantage or disadvantage to that. It is not really a form of monovision.
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Yes, if the technician taking the measurements is doing a good job they will keep repeating the measurement until they have a good one.
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The IOL calculation sheets vary and they may or may not tell you what residual astigmatism is.
Lynda111 aspen88
Edited
I was quite myopic prior to cataract surgery and had worn eyeglasses for many years . I asked my cataract surgeon to target me for intermediate vision in both eyes and she did. I also had two diopeters of astigmatism that I did not correct with a toric. I expected my new eyeglasses prescription after surgery would fully correct my vision. As it was, I ended up rarely needing eyeglasses at all, but mine was maybe a unique case. That said, I don't see why a cataract surgeon would not heed your wishes for intermediate vision.
You can target near(@Bookwoman here did) and seems happy with it since she spends a lot of time reading and on the computer. Many others target distance and wear eyeglasses to correct for near/intermediate. Toric IOLs are about a $1,000 extra expense for each eye. Or you can go for mini-monovision as Ron suggested. Why did your doctors advise against mini-monovision?
aspen88 Lynda111
Posted
i think it's because I have not tried it and I do not wear contacts. maybe I should try wearing contacts again but i had a hard time getting them off my eyes.
RonAKA aspen88
Edited
There are two basic types of daily disposable soft contact lenses. The older lower cost ones are made of a hydrogel material. The newer and slightly more expensive ones are silicone hydrogel. In my experience they are very different in comfort and ease of handling. I was using the older hydrogel type, J&J Acuvue Moist, and finally gave up on them due to handling problems. They were like having a small piece of Saran wrap and trying to put it in your eye. Hard to get it off your finger, and get it to stick to your eye. They are horrible to use in my opinion, and even when you get it in your eye, it is not comfortable enough to wear all day. They seem to dry out and get sticky.
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When I was doing my monovision trials I did a little more research on the types of contacts and identified some of the silicone hydrogel versions that were much easier to use, and they were comfortable enough to wear all day. The best ones I found were, in order:
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A newer Alcon Precision 1 product came out after I had done my trials, and the specs look good, but I have not tried it.
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If you have had handling and comfort problems in the past, it may be worth doing a trial of these newer silicone hydrogel material lenses.