Difference between spherical and cylindrical lens and bifocal
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sperical : the term sphere meant that the correction for nearsightendnes or farsightedness is sperical
cylindrical this indicates the amount of lens power for astigmatism cylinder power always follows sphere power in an eyeglass prescription
bifocal lens : are eyeglasses with two distinct optical powers
cylindrical this indicates the amount of lens power for astigmatism cylinder power always follows sphere power in an eyeglass prescription
bifocal lens : are eyeglasses with two distinct optical powers
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