Mini Mono vision for near intermediate

Thanks a lot for your input 😃

In my case it was done deliberately to enable better range.

I appreciate the time you took to respond. The question is about the ability to train the non dominant eye to "take over" for intermediate range.

Some make the claim that you can train your eyes. A few years ago I tried monovision with contacts, and I adapted to it reasonably well, without any specific training activities. However, here is a video you may want to search for in youtube and consider.

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How to get the best from Monovision Wellingtoneyeclinic

Watched it - really interesting .

I am not an expert and don't want to mislead you.

I guess the "good candidate" has something to do with the big difference you have between your eyes. But i suggest consulting a specialist.

I believe that the purpose of this forum is to help one another to understand the issue of their eyesight.

And yes, I understand you are not an expert.

But are you not able to give me some commentary on points 1, 4, and 5?

I have already seen my eye specialist and will see her again when the commotion lifts over the coronavirus.

The purpose of my post is simply to gather enough information to enable me to speak to her intelligently when we next meet .

Thank you.

I am anxious to learn why I am a "good candidate".

My last prescription reads as follows:

DIST_Right eye: Sphere -3.25 Cyl: -1.75 Axe 95

DIST_Left eye : Sphere: -.25 Cyl: - 1.50 Axe 65

ADD Right eye:2.50 SEG 23

ADD Left eye: 2.5 SEG 23

1.Are you able to tell me what is my Dioptre from this information?

2.Does this information reveal why I am supposed to be a "good candidate"?

3.If not, what determines if I am a "good candidate" or not?

4.Are you satisfied with your selection of monovision, and may I ask why?

5.Are you now totally free of spectacles?

Any information you ( or any reader on this forum) can provide me would be greatly appreciated, as I still have plenty of time before making a firm choice.

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I think I may have answered this before in another post, but in any case...

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1. I see nothing out of the ordinary with your eyeglass prescriptions. You seem to have near perfect distance vision in your left eye with some astigmatism. Right eye needs some help for distance and about the same astigmatism. An add of +2.5 is pretty standard for reading when we get older. This said there is not much you can determine for sure from the eyeglass prescription. The issue is that both your sphere and cylinder for astigmatism is determined by both the shape of your lens and the cornea. You can have some error in each which can add together or subtract to determine your overall correction needed. Since the lens is being totally taken out, the remaining error that needs to be corrected is in the cornea. The error there is determined by the cornea topography measurement. You may or may not need astigmatism correction once your natural lens is out of the picture. The minimum astigmatism that is normally corrected is -0.75 D. I believe it is a good idea to get a toric lens to correct it, if your residual is -0.75 or more.
2. I don't see anything in your eyeglass prescription that would make you a good candidate for monovision. There is nothing that suggests it is not suitable either.
3. What would make you a good candidate for monovision is what you want for an outcome. Do you want to be totally free of glasses for distance and reading? If yes, are you willing to put up with some halos and glare issues especially at night, if you use a multifocal lens? If no, or also if you are not willing to pay the significant premium price for them, then a multifocal is not likely a good choice. Then you are in the monofocus lens zone. Do you still want to be glasses free almost all the time? If yes, then monovision would be the right option. Normally the dominant eye is corrected with the IOL to plano for distance, and the non dominant eye is under corrected to about -1.0 to -1.5 D. The desired outcome is to use the under corrected eye for reading, the plano eye for distance, and a combination of the two for intermediate vision. It is good to test your tolerance for it with contacts though. The other option is to correct both eyes for distance and use reading glasses, or although it is less common, both eyes could be corrected for reading, and then you would need prescription glasses for distance and driving. They are all options, but it kind of depends how much of the time, and when you want to be without glasses. Depending on what your preferences are is what would make you a good candidate (or not) for monovision.
4. I was scheduled for the first eye in August, but now with COVID-19, who knows when I will be done. My plan was to get the first eye done for plano distance, and then depending on how it turned out then consider monovision, probably with a -1.25 under correction in the second eye. I will test that with contacts to see what I like and can tolerate. My fear now is that my surgery will be delayed for so long that I will not have good enough vision left in my better eye to evaluate it. My bad eye now is too bad to evaluate monovision with contacts.
5. I am not expecting to be totally free of glasses. When I tried monovision with a -1.25 under correction in one eye, I did need reading glasses for fine print. I expect it would be the same with IOL monovision. My plan B if I do not get quite what I like or have some residual spherical or cylindrical error is to just get progressive prescription glasses to give me the very best vision for both distance and reading. The issue with glasses of course when you don't always need them, is actually having them with you when you do need them!

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   Hope that helps some. Stay safe with that COVID-19 out there. I see that Quebec seems to be suffering the most of all the provinces. I'm worried that the lock down is going to get so strict that they are going to arrest us old guys when we go outside! Take care...

Personally i think that the most important factor for Monovision is weather you can tolerate it or not. Some people hate it - they simply can't stand the difference. So try to figure out with contacts or by other means where you stand, before the surgery.

You may want to go with "Mini - Monovision" in which the dioptr diff between the eyes is smaller. Hope this helps.

For total "eye power" you take the dioptr and add to it half the cylinder:

in your case :

Right eye : -3.25 - 1.75/2 =~ -4

Left eye: -0.25 - 0.75/2 = ~ -0.5

For the question weather i am satisfied, I am just after my operation, so its too soon to tell.

Thank you for your posts. I will continue researching .

Plenty of time for this, particularly now that I am locked up at home.

I appreciate all comments .

Lots of info in here. Thank you VERY much for taking the time to post.

I will continue to research and hopefully, I will become more profIcient at understanding my options.

I find that the specialists are so busy at what they are doing, they do not take the time to properly explain.

(Or, more likely, have trouble in succeeding to have their patients actually understand because of the complexity.)

From my experience with one private clinic I think they are so busy they do not have time for a bedside chat. They schedule cataract surgery like a production line and performed maybe a dozen in the morning and they do just this twice a week. The time from initial consultation to actual surgery was seven months.

It is also obvious from just the discussion here that it is a complex matter and it is not easy to predict the outcomes.

Thanks for your post.