Naoye, as far as I can determine, Alcon's Acrysof toric iol is still only available in a limited spherical power range (16.0 D to 25.0 D). If you are very myopic and wanting to correct your vision for distance, it is extremely unlikely that anything in this range would work for you. So you might not even be a candidate for the toric lens. (For comparison, I was about -6.75 D and needed a 14.0 D lens--lower numbers correct more myopia.)
Laura4, according to Alcon's toric power calculator, the 1.50 D toric model is supposed to be appropriate for eliminating between .75D and 1.50D of astigmatism. So I guess you were in the range (but barely).
In early April, I'll see with my cataract surgeon to decide on the type of lens. I would like to ask you a few more questions, if you have time to consider them.
Just to summarize things I've already mentioned:
My prescription is high, pupils are small and astigmatism in my left eye is -1.5 and in my right eye is between -1.5 and -2. I won't be able to wear contact lenses afterwards because of pterygia. Lately, I've been seeing more distortion and a smaller image in my R eye with some double vision - but hopefully this will be improved with an ERM peel after the cataract surgery.
My cataract surgeon has recommended a toric lens because it would correct the astigmatism without LRI and without wearing glasses all the time. He says he has implanted many of them since last year. However, he'd probably be quite willing to use another lens as he says I'm borderline.
In a 2007 post, Jodie mentioned that the aspheric lenses work better with larger pupils and that they improve contrast sensitivity and distance vision. She also mentioned that near and intermediate vision are not as good as with a conventional lens but that was not important to her because she planned to wear multi-focal contacts post-surgery.
Here are my questions:
- Because of my small pupils and inability to wear contacts, do you think I would be better with just a conventional lens rather than an aspheric one?
- With either an aspheric or a conventional lens, I would have LRI or wear glasses all the time. Would LRI be risky for me because of a previous HSV infection?
- If I did get a toric lens, would my small pupils make me less prone to dysphotopsia?
- On the other hand, would my high prescription or other factors make me more prone to it?
- Are there any particular questions I should ask my cataract surgeon?
Thanks very much for reading this long post and for considering my questions.
.8 D of astigmatism is very little, and it could have been corrected with a limbal relaxing incision, as Dr. Hagan stated. My technical knowledge about toric lenses is limited, but I remember reading an article someplace about determining which toric lens to use. I'll try to find it again. Would it be possible to safely explant your toric lens?
The only reason given for both the negative and positive dysphotopsia is the usual answer - it can sometimes happen.
I hope I am understanding the technology of these Toric lenses. I believe there are 3 models in 3 different powers. Mine was the lowest, an SN60T3. If Dr. Hagan is correct, and it's not possible to do more adjustment of the power from the 1.5 of my model than it would be true that I would not medically have been a candidate for even the lowest power Toric. But I still am not sure of my technical understanding. I was also told that a 1.5 would adjust back to a 1.0. Even so, that's crazy if I only had .80 to begin with.
Laura4
Laura4