What does it mean when your eye prescription is negative?

What does it mean when your eye prescription is negative?

In general, the further away from zero the number on your prescription, the worse your eyesight and the more vision correction (stronger prescription) you need. A “plus” (+) sign in front of the number means you are farsighted, and a “minus” (-) sign means you are nearsighted.

Is SPH the same as power?

Power (pwr) / Sphere (sph) / Dioptre (D): This value is the power of the lens needed to correct your long or short-sightedness and is measured in Dioptres (D). A minus (-) sign indicates that you are short-sighted, whereas a plus (+) sign shows that you are long-sighted.

What is the difference between SPH and CYL?

SPH (or Sphere) designates the amount of lens power that is needed in order to correct nearsightedness or farsightedness. CYL (or Cylinder) indicates you have a condition where the cornea and/or lens of the eye are irregularly shaped causing blurred vision, in other words, astigmatism.

What is normal SPH and CYL?

It is closely related to SPH. ADD: Short for addition, ADD refers to the power that needs to be added to the lens to improve near vision. CYL: Short for cylinder, CYL indicates a correction for astigmatism. It is usually a number between -4.0 and +4.0.

What does SPH mean for eyes?

Sphere (SPH) – The term “sphere” means that the correction for nearsightedness or farsightedness is spherical, equal in all meridians of the eye. This indicates the amount of lens power, measured in diopters (D), prescribed to correct nearsightedness or farsightedness.

What is the medical term for both eyes?

OD refers to Oculus Dexter while OS represents Oculus Sinister. They are Latin words that mean right eye and left eye respectively. OU refers to Oculus Uterque. It stands for both eyes.

What is SPH and CYL in eye test?

SPH (Sphere of the eye): The lens’ ability to refract light. CYL (Cylinder of the eye): Correction number needed for astigmatism.

What is cyl and axis for glasses?

What does Sphere, Cylinder and Axis mean? ‘Sphere’ is basically a measure of how strong your prescription needs to be. The number marked ‘axis’ describes the orientation of astigmatism. It will be a number between 1 and 180. The number under ‘cylinder’ provides the lens power needed to correct the astigmatism.