To: Graeme Chapman <>
Subject: cataracts
From: Peter Shute <>
Date: Sun, 16 Dec 2012 23:51:59 +1100
I don't think multifocal replacement lenses work the same way as multifocal 
glasses. Rather than having different zones of focal length that you look 
through as appropriate, you can't choose which part of the lens to look 
through, so there are concentric rings of each focal length.

Therefore one's brain has to learn to make sense of an image composed of two 
focal lengths superimposed. Apparently it works, but I wonder if a birder might 
notice a loss of sharpness compared to monofocal lenses.


I've no idea of the accuracy of the information on that website. Can anyone 
comment on this from experience?

Peter Shute

Sent from my iPad

On 16/12/2012, at 8:40 PM, "Graeme Chapman" 

Hello Peter,

Your doctor will ask you what sort of lenses you want put in, either to 
optimise short or long sight. I didn't know you could get multifocal ones - I 
don't like them in ordinary glasses, they affect my peripheral vision.

I have had replacement eye lenses to optimise long sight for about four years. 
My right eye has 20/20 vision, the left one not so good because of another 
problem. The main negative is that my eyes no longer tolerate glare - I have to 
wear sunglasses whenever I'm out in bright light. My specialist said that 
"everyone should wear sunglasses from the day they are born".
I also have a problem now with dry eyes and have to use Tears plus - fairly 
common for older people apparently but I didn't have to before the operation.

Another problem I have is that my eyes are slightly out of collimation 
(alignment). The specialist who did the op simply referred me to an 
optometrist, but another doctor (friend) said that my right eyelid may have 
been stretched during the operation (touch the eyelid lightly and the eyes line 

My only advice is ask lots of questions and even though this is now considered 
a simple procedure, all doctors are not equal. So the answer is I don't see 
birds as well at a distance anymore, but perfectly well through binoculars or a 
camera. I don't hear as well either!! We are all getting older.

Best wishes

Graeme Chapman


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