A prescription for will include a PRISM and BASE value. These are needed to tell us how to shape the lens so that it can accurately align the wearer’s eyesight. The base value will show either “in” or “out”, or “up” and “down”, indicating the direction the prism should be angled. Glasses Prescription. Patient Expiration date.. Astigmatism is measured in diopters. A perfect eye with no astigmatism has 0 diopters. Most people have between 0.5 to 0.75 diopters of astigmatism. People with a measurement of 1.5 or more typically need contacts or eyeglasses to have clear vision. Of the three numbers on your contacts or glasses prescription, the last two refer to astigmatism:
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If both eyes are being referred to the abbreviation you will see is OU (oculus uterque) meaning both eyes. The next term on your prescription is Sphere (SPH) and is are measured in diopters (D). This number tells you how strong your lenses need to be to correct your vision. If this number has a minus sign (-), you are nearsighted; if the.. The two measurements you should also see on your contact lens prescription are: Base Curve (BC): The curvature of your contact lens, which should mold comfortably to the curvature of your natural eye. This measurement in millimeters (mm) always falls between the numbers 8 and 10.
