Known as the astigmatic dial, the test is very simple and takes seconds to complete. All you need to do is stare directly at the centre of the circle with one eye covered and watch out for any ...

A blood spot in the white of your eye, known as a subconjunctival hemorrhage, is caused by the bursting of tiny blood vessels beneath the clear surface of the eye. It is typically a harmless condition ...

Microscopic optical resolution test device From Wikipedia, the free encyclopedia In practice, the spatial resolution of an imaging system is measured by simply inspecting the system's image of the ...

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