Any difference of Residual Astigmatism and irregular Astigmatism
A follow up with the discussion of irregular astigmatism.
I went to an eye doctor to ask for a referral to another cataract surgeon.
He told me the similar things you told me - he doesn't believe a pin-hole 20/25 against my glasses vision of 20/50.
He advises me my vision may not be up to 20/25 even with the cataract removal as I am likely to have residual astigmatism afterwards. He doesn't have a corneal topograph machine nor a hard contact lens.
Is there any difference between irregular and residual astigmatism ?
More important, does the pin-hole normally under-estimate or over-estimate the post-operation vision (at my range of vision) ? This really affects my decision to go for a cataract surgery or not. Is jumping from 20/50 to 20/25 means a lot for a cataract surgery ?
You have to determine your best corrected vision. It does not make sense that you do not have some astigmatic correction in you glasses if the pinhole makes a significant difference. However, a pinhole vision can not differentiate regular from irregular astigmatism. No astigmatism is like a volley ball. Astigmatism is like a football. The two radii of curves is constant and can be corrected by glasses. Irregular astigmatism is like a distorted football and can not be corrected by glasses. A hard contact lens makes an irregular surface smooth.
You really need to find a doctor who can do a complete examination and does surgery.
My glasses does have astigmatic correction (around 2.0D at 180 deg). I am going to see a cataract surgeon with a first consultation and hopefully there will be a test using the corneal topograph machine.
If it is confirmed that there is irregular astigmatism, does it imply the pin-hole result (20/25) will over-estimate my post-operation vision.
Sorry I forget put that in my previous post.
My 20/50 is tested with a glasses to correct my astigmatism with magnitude of 2 diopter and 180 deg. This is the prescription before my RD surgery and the optometrist cannot find any difference in astigmatism after the RD surgery. Of course, I don't rule out the possibility that this measurement is not accurate.
If there is irregular astigmatism, can it be reduced during the cataract surgery.
Just want to add more info.
I don't have Lasik or any other surgery before except the RD surgery in my left eye. Not sure if the buckle can cause irregular astigmatism.
As I mentioned before, when viewing distant objects more than 30 ft like signs in shopping mall, my left eye has double vision (sometimes even 3 to 4 shadows with the same letter if the distance is more than 100 ft) even with my glasses. Not sure is it caused by the cataract.
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