Thank you for the picture showing the area of your visual defect. Since the condition is constant and shows up on the corner of the amsler grid that localizes the pathology to your macula
. This is the area of your retina that is used for all your daily vision functions such as reading, watching TV, driving etc.
You may have some edema, exudate or abnormal blood vessels leaking in that area. It would be common for an optician to miss pathology such as this as they really aren't trained in these areas.
I agree with your plan to see an ophthalmologist
for a complete examination ASAP. They will be able to find the source of your symptoms, and once the cause is known, suggest treatment options.
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