Eyeglasses
say a lot about you.

UNDERSTANDING YOUR PRESCRIPTION
Click on the Terms to Define

	SPHERE	CYLINDER	AXIS	ADD
O.D.	-1.OO	+0.75	90	+2.50
O.S.	-2.00	+1.50	110	+2.50

THE NUMBERS ARE WRITTEN IN DIOPTERS.

A DIOPTER IS A UNIT OF MEASUREMENT BASED ON HOW MUCH LIGHT RAYS WILL BEND AS THEY PASS THROUGH THE LENS.

THE HIGHER THE NUMBER THE STRONGER THE LENS AND THE MORE LIGHT RAYS ARE BENT.

O.D. - OCULUS DEXTER OR RIGHT EYE

O.S. - OCULUS SINISTER OR LEFT EYE

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SPHERE - REFERS TO HOW NEARSIGHTED(MYOPIC) OR FARSIGHTED(HYPEROPIC) YOU ARE. A (-) IN FRONT OF THE NUMBER INDICATES MYOPIA(NEARSIGHTEDNESS) AND A (+) IN FRONT OF THE NUMBER MEANS HYPEROPIA OR FARSIGHTEDNESS.

CYLINDER - REFERS TO ASTIGMATISM; IF YOU HAVE ASTIGMATISM, YOUR CORNEA IS FOOTBALL SHAPED INSTEAD OF BEING SHAPED COMPLETELY SPHERICAL LIKE A BASKETBALL.  ASTIGMATISM CAN BE LIKE A FOOTBALL STANDING ON ONE END OR A FOOTBALL ON ITS SIDE.

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AXIS - THIS IS MEASURED IN DEGREES AND A NUMBER WILL ONLY BE PRESENT IN THIS COLUMN IF YOU HAVE ASTIGMATISM.  IT INDICATES WHETHER THE ASTIGMATISM IS VERTICAL OR HORIZONTAL AND EXACTLY TO WHAT DEGREE.

ADD - INDICATES THE POWER OF MAGNIFICATION NEEDED IF YOU REQUIRE  MULTIFOCAL LENSES.

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