“CGA can help to protect the body from a condition called hypoxia, caused by a lack of oxygen.
“Your retina is particularly vulnerable to hypoxia, so drinking coffee could help prevent any damage to your eyes and vision.
“Tests using CGA in its purest form have shown that it can prevent deterioration of the retina, but there is yet to be solid proof that drinking coffee can help with this.”
It concludes: “Overall, it still isn’t completely clear how coffee affects eyesight and why it seems to have different effects to other caffeinated drinks such as tea and energy drinks.
“As with everything, it’s a good idea to enjoy coffee in moderation and try to keep on the lower side of the recommended daily caffeine allowance of 400mg.”