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, such as green cabbage, spinach, broccoli, lamb's lettuce, paprika or apricots. Retinol (vitamin A1) is most notably present in animal foodstuffs such as liver, fish, dairy products and eggs. If the body [...] and various environmental factors give rise to free radicals which the body's cells attack. Vitamins B2, C and E protect the eyes by capturing and neutralising free radicals. Good sources of vitamin C are

the focal length of a lens measured in metres: a power of +5 dpt therefore has a reciprocal length of 1/5 metres or 20 centimetres. What is long-sightedness? In the case of long-sightedness, the eyeball is [...] There is no standard answer to this question, as it differs for each vision task: a visual acuity of 0.1 is sufficient for a person to be able to orientate themselves outdoors. However, a visual acuity of [...] on visual acuity? No. In order to be able to read we require a functioning retinal surface of around 2.5 degrees to the left and right of the fixation point, i.e. a visual angle of around 5 degrees in total