Comments on: Prism Correction

By: Bar

Bar — Wed, 19 Aug 2009 14:12:35 +0000

A 4th nerve palsy in the left eye, as a result of Neuro Surgery in 2008 has caused double vision. The double vision had an element of tilt, which has recently been addressed via eye muscle (squint) surgery. I still experience double vision when looking straight down and down to the right. The expectation is that a prism in glasses will be able to line up the images.

To my question: Can prism be fitted so as it only comes into play if looking straight down or down and to the right?

Any info would be helpful
Thanks
Bar

By: Kim

Kim — Wed, 01 Apr 2009 05:36:45 +0000

I have monocular vision. I had to increase my prescription and my prism increased from 2 to 6 on each eye. I am right eye domininant, although I alternate between my two eyes to see. I got my new glasses and now the glasses make me use my left eye more and cause my right eye to turn inward. This taxes my muscles behind my right eye, which are good and the muscles hurt and the eye is irritated. Any suggestions? I have went back to my opthamologists and told them the prism is misplaced in the right lens, but they ‘don’t believe’ me?

By: Abi

Abi — Sun, 23 Nov 2008 14:41:00 +0000

Hi there! I have just been reading all the posts here- it’s all really interesting.. i have just collected my new glasses (with prisms in). i have astigmatism and slight short sightedness and also need prisms. I kinda assumed the prism was in both lenses but this may not be the case at all.

Anyway.. they told me i might get a funny ‘pulling sensation’ but i’m experiencing something much weirder… something i wouldn’t call just a ‘pulling sensation’.

When i look in front of me, everything gradually starts to slope away so it feels like i am at the top of a ramp and everything drops down away from me. I couldn’t walk down the garden steps without each step looking like is was sloping diagonally downwards, away from me. Also, as I walked through a carpark the ground felt as if it was getting higher and higher until the floor appeared to be half a meter from my face, i felt like i had sunk into the ground up to my waist! Really odd. I am trying to keep them on in the hopes that the side effects will wear off. But i wanted to make sure this is normal and not something to worry about. Also.. once my eyes adjust will it be just as weird when i DON’T wear them? I wouldn’t like to be tied down to wearing them because every time i take them off the world would start to seem warped as my eyes re adjusted!

Thanks so much for your help!

Abi

By: Randy

Randy — Fri, 21 Nov 2008 03:26:12 +0000

My dad has gotten new glasses and they are giving him a dull headache and his vision is not as good as with the old pair. His old prescription has prism correction and the new ones don’t. His overall vision has not changed greatly. Could this cause his problem with the new glasses

By: David

David — Wed, 01 Oct 2008 12:49:08 +0000

My son was told by an optometrist that though he has 20/15 vision his eyes were not teaming and he had less peripheral vision than was ideal. He prescribed prism lens as a means of correcting this condition. My son wore them briefly but grew resistant since he didn’t notice any difference when he wore them and thought they slightly obscured his vision. This optometrist predicted that our son’s school work and athletic performance would be effected if he didn’t correct this problem. Recently we’ve seen a drop off in both and are now wondering if we should revisit the correction of his vision. Can anyone comment on the affectiveness of prism glasses? Could one’s vision really be a factor in a drop off in performance even if they have 20/15 vision? Thank you for sharing your thoughts and experience.

By: Michael

Michael — Fri, 15 Aug 2008 06:53:47 +0000

Hello, I recently had an eye exam and was told I will need prism glasses because I have a 3.5 diopter ‘lateral displacement’. I’ve worn glasses for about 15 years (I’m 37) and I’ve never had this problem before. I was wondering if later displacement is normal? The Optometrist mentioned that displacements greater than 5 diopter can be a sign of an underlying neurological problem but because mine was 3.5 I should be fine. So, I was wondering if lateral displacements are rare and if I should consider having additional testing such as a neurological exam.

Many thanks
Michael

By: Louis Gardella

Louis Gardella — Fri, 30 May 2008 13:29:13 +0000

I am a 53 year old male that has been having extreme difficulty over the past three months not being able to focus my eyes! What happens is that my eyes just start moving around especially while driving,so much so that I have to squint and pull the car off the road! I have been wearing glasses since I was 5 years old,my lenses use to have prism in them but it was removed in 2002.I need to find out how to resolve this as it is getting to the point where I cannot function anymore.

Louis Gardella

By: Namak

Namak — Fri, 11 Apr 2008 19:04:40 +0000

Hi, I’m at work and want to cut the lens with 0.5 BD using Essilor Kappa. How do I centre the optical centre of my lens? Do I move it 0.5 down or 0.5 up?

I appreciate your help:)

By: Angie

Angie — Mon, 31 Mar 2008 00:00:29 +0000

HI Brian!! I apoloize for not responding sooner, but I do work a lot and only have one day off.
I really do not think that there is any way that you can test out your prism correction on your own. What I would suggest is going back to your doctor and explain this to them or get a second opinion with another eye doctor. You do have a lot of prism so I would not just go by just one doctor. That is just my opinion. Sometimes it takes many visits to get prism correction right, especially with a high amount of prism. Keep me updated on what you find out. I really would like to know th outcome!
Thanks Brian!!

Regards,
Angie

By: Brian

Brian — Thu, 27 Mar 2008 04:09:35 +0000

I just recently got glasses for the first time (I’m in my mid-thirties). They have no correction but have some prisms. I’ve had the “not fused” vision for as long as I can remember and anytime I mentioned it before the eye doc basically blew me off because I would say that if I tried to focus I could get the double to go away. It seems now that I probably never could get the double to go away, but I could get the really bad double (happens if I let my gaze go) to go away.

Anyway, I got 3.0 Out (both lenses) for my first pair. I wasn’t sure they were working very well. I went back and he set me up with 5.0 Out (both lenses) It seems like these might be worse. The lady at the eyeglasses place (my doc does not sell glasses, only an eye doc — he is an M.D.) said that with this much prism it might take a while to get used to. I was hoping to only have to wear them when doing paperwork (I can’t fill out the forms without closing one eye because I see too many boxes to put numbers and letters in).

Is there a way to test them out on my own? Specifically is there a diagram or graphic or something that I can print out or look at on a computer screen that can help me tell if I am over-prism-ed now, and/or was under-prism-ed before. It seems wasteful to go get a 4.0 out pair just to test it out. (This re-lens was free as a “doctor error” but you only get that once.)

Thanks for any help. This seems to be a pretty hard thing to find good info on.