When I see a patient who takes a lot of prism, I like to demonstrate to my staff how the patient sees without their prism. Putting prism in front of a person whose eyes are not misaligned gives them the same symptoms of the patient. I gave a clip to my optician with prism on it for her to look out of. She puts it on and says "Wow! this is great!" I see so clear!!!!
She always complained of not seeing clear enough to me. Of course she didn't because she had a ghost image. She described it as seeing "smeary" always trying to focus. Interestingly, she did not complain of headache or dizziness at all, but she did have VH. With the prism glasses her world is so much easier. Aligning her eyes gave her the binocular vision and dept perception that she was missing.
Now if a patient uses that world "smeary" or just not sharp enough, I immediately pull out my instruments from Dr. Debby and screen for VH. Sometimes, a little prism is all you need.
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