Eyeglass prescription

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Eyeglass Prescription

An eyeglass prescription is a written order by an optometrist or ophthalmologist that specifies the value of all parameters the optician needs to create and fit eyeglasses to the end user.

Pronunciation

  • Eyeglass: /ˈaɪˌɡlæs/
  • Prescription: /prɪˈskrɪpʃən/

Etymology

  • Eyeglass: The term "eyeglass" comes from the Middle English word "eyeglas", which is a combination of "eye" and "glas" (glass).
  • Prescription: The term "prescription" originates from the Latin word "praescriptio", which means "to write before".

Components of an Eyeglass Prescription

An eyeglass prescription includes several components:

  • Sphere (SPH): This indicates the amount of lens power, measured in diopters (D), prescribed to correct nearsightedness or farsightedness.
  • Cylinder (CYL): This indicates the amount of lens power for astigmatism.
  • Axis: This describes the lens meridian that contains no cylinder power to correct astigmatism.
  • Prism: This is the amount of prismatic correction in a prescription.
  • Pupillary Distance (PD): This is the distance between the centers of the pupils in each eye.

Related Terms

  • Optometrist: A healthcare professional who provides primary vision care.
  • Ophthalmologist: A medical doctor who specializes in eye and vision care.
  • Optician: A technical practitioner who designs, fits and dispenses corrective lenses for the correction of a person's vision.
  • Diopter: The unit of measurement of the optical power of a lens or curved mirror.
  • Astigmatism: A common vision condition that causes blurred vision due to the irregular shape of the cornea or the lens inside the eye.
  • Nearsightedness (Myopia): A condition where close objects appear clearly, but far ones don't.
  • Farsightedness (Hyperopia): A condition where distant objects may be seen more clearly than objects that are near.

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