It is true that ultraviolet light, which is used during the photo-therapy, can damage the eye's retina if the eyes are directly exposed. That's why covering the eyes with an eye mask is absolutely necessary. But eye damage from photo-therapy depends upon the time exposed to UV-light without eye protection. In your grandson's case it is very hard to find out how long the baby was exposed to photo-therapy without eye protection.
There are a few more things that need to be considered:
1.Which part of your grandson's eyes was damaged and resulted in blurred vision and inability to focus? It is obvious that something is wrong with his eyes but can this be eye damage caused by the photo therapy? Precise diagnosis and an opinion from an ophthalmologist is absolutely necessary.
2.Your grandson was born prematurely which is another risk for birth defects including blindness.
3.Blindness and inability to focus could also be due to a neurological disorder which can't be related to the photo-therapy.
You should ask for an expert opinion from an ophthalmologist.
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