Reading under low light conditions will put strain on the eyes but not cause any irreversible damage. Before electricity, people used to read after dark in candlelight that was always dim. Their eyes did not get damaged for that and neither shall yours.
Having diabetes can damage which part of the eye?
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Diabetes can cause harm to the retina and lead to a condition known as diabetic retinopathy. If this condition is not given adequate medical attention, it can deteriorate into permanent blindness.
What is the most effective way of keeping the eyes healthy and free from harmful substances/infections?
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This is the best way to keep the eyes clean and healthy. It will not only remove particulate matter from the eyes but also dilute and dissipate any chemicals that may have encroached onto the eye.
What is the best way to cure conjunctivitis and other eye infections?
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The best way to deal with eye infections is to avoid doing anything that would further irritate the eyes. In most cases, eye infections heal on their own, especially when the eyes are frequently washed with clean water.
Staring at a screen for too long will hamper vision
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Staring at a screen for prolonged periods of time does not hurt the eyes, although not blinking certainly does. Blinking provides the necessary lubrication which keeps eyes protected but most people who gaze at television and computer screens tend not to blink.