one pupil bigger than the other

[rsnr]

Hallo there. A few months I was diagnosed with KC. So far I haven't done anything about it because I had do start my PG at Uni. I am 23. During the last weeks, I noticed the pupil of my right eye (which is far more advanced in the KC) is much bigger than the left one when dilated. when I turn on the lights they get equally small. Do you think this may be related to KC? I mean I hope it is. The vision in my right eye has worsened a lot during the last months and now this problem with the pupils... I am starting to get really worried. Do you think it may be a brain tumor ? I also see letters on my pc double when they're on a dark background, but this is a common symptom of KC...

martin

[Andrew MacLean]

Martin

All the best with your Postgraduate work.

You could make sense of different sized pupils in low light conditions; if KC is scattering light onto the back of your eye, rather than focusing it, then a larger pupil in your worse eye might be your eye's 'strategy' to maximize its ability to see.

In your position, I'd try to get an early appointment to see an ophthalmologist. Some treatments for keratoconus are only available before your condition deteriorates too far for them to be effective.

All the best

Andrew

[rosemary johnson]

Hi.
That happens to me too.
Generally, it is when I have a contact lens in one eye only and the eye without the lens, the pupil is bigger.
I've always assumed it is becuase I see pretty poorly in low light ("night blind", they call it) and more so without the lenses in. So the pupil of the lens-less eye opens more, trying to let more light in and see better in the gloom.
At least, that's what I've always assumed in the reason!
Do ask an eye specialist about it, though, particulalry if it worries you.
Dunno if this is of interest to you..... apparently, there's been some research which says that people tend to find other people with bigger pupils sexier than those with small pupils (people of the appropriate gender for their preferences, that is).
So if you're trying to get to know this stunning beauty in the student bar, it could be an advantage!
Rosemary

[tneedham]

Dont Worry.

I had exactly the same thing with exactly the same worries.
I saw my specialist who told me that its because of the KC. Below is how i understood it.

He told me that as the light is scattered in different directions as it hits the cornea due to the KC, less effective light enters through the pupil as should be.
The worse the KC, the more light is scattered, the less light enters the eye. The pupil adjusts itself accordingly to allow more light in.
As the pupil gets bigger it focuses light from a wider diameter of the distorted cornea into the eye, that is more scattered light from a larger area, meaning that the larger your pupil is, the worse the ghosting(etc....) effects of your KC. and ultimately the pupils diameter will get even bigger to accomodate this.
This is why at night KC vision is often worse, and why the difference in pupil size will be more noticable in low light conditions.

Hope this helps, if you are still worried, get to the hospital, it's better to be safe than sorry.

All the Best

Tom