Stereoacuity

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chinju

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I encountered someone who has a stereoacuity of 400secs Titmus Stereofly (unaided). No abnormalities in Worth-4-dot. Near VA 20/20 @ 40cm RE and LE. However he is -1.75DS in BE.

I did check the pola visors and the chart beforehand. Only one thing I didn't check was the lighting.

Q: in this case besides lighting, can there be any other causes of the reduced stereoacuity?
Q: and also, is it possible to have fusion but no stereopsis?

thx!
 
Unless you have a special kind of worth dot flashlight, it doesn't test suppression at near—only distance. What is the patient's uncorrected binocular vision status at near? Could they be an intermittent exotrope?
 
you can test W4D at 16 inches 🙂
 
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