My mum has a shadow behind 1 of her eyes, she is 59 yrs old, wears glasses for reading, only symptom she is showing is vision issues, but can see when wears glasses. she has epilepsy , and is aneamic. she was sent for an eye test in an opticians whereby they can use a machine they didnt have in her local opticians..dye was placed in her eye and still the shadow was there, can you shed any light on what this may be? her gp is doing blood tests to test for diabetes .