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The numerical aperture of a microscope objective defines the objective's resolution. Each microscope objective has a minimum and maximum magnification necessary for the details in an image to be resolved. A simple formula for the minimum value is (500 x NA). And for the maximum magnification (1000 x NA).
Abstract. Nonarteritic anterior ischemic optic neuropathy (NAION) is the most common clinical presentation of acute ischemic damage to the optic nerve. Most treatments proposed for NAION are empirical and include a wide range of agents presumed to act on thrombosis, on the blood vessels, or on the disc edema itself.I-Clinical presentation. Nonarteritic AION is an acute or subacute optic neuropathy resulting from small vessel infarction of the anterior optic nerve. Symptoms include acute, unilateral, usually painless visual loss that evolves over several hours to days.