"I'd had blurred vision in my left eye for a couple of years, " Mr Matthews said.
Dubbed computer vision syndrome, or CVS, symptoms include redness, burning, irritation and blurred vision.
It is extremely toxic, causing a high temperature, blurred vision, confusion, euphoria, delirium and hallucinations.
Blurred vision, for example, may suggest you need a prescription change, or it could be a sign of another problem.
Messages from the brain to the rest of the body are disrupted, resulting in difficulty moving, muscle weakness and blurred vision.
Friends said he was suffering from short-term memory loss and blurred vision.
Ms. Roundtree, the Novant patient, says she mentioned in passing during her checkup last year that she was having some blurred vision and dizziness.
Patients with prediabetes may have no symptoms at all, but some people experience problems associated with diabetes like blurred vision, unusual thirst and frequent urination.
Patients who develop diabetes mellitus most commonly have initial symptoms of increased thirst, increased urination and blurred vision due to high amounts of sugar in the fluids of the eye.
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"He seemed to recover very quickly but he had blurred vision in his left eye when he started to run and we decided not to take any chances, " said the coach.
Needing to go to the toilet more frequently than you used to, feeling constantly thirsty, lethargy and blurred vision are all signs that you might be suffering from type 2 diabetes.
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Severe headaches and blurred vision are also among symptoms.
Eye experts say that you are myopic if your vision is blurred beyond 2m (6.6ft).
The vision, though blurred, is wonderful to have, and I consider myself a very lucky person to have met Mr. Daya and his great team.
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