Eyeglass prescription

prescriptionprescription glasseseyeglass prescriptionsprescriptionscylinderprescription eyeglassescontact lens prescriptionCylinder (optometry)few parametersglasses
An eyeglass prescription is an order written by an eyewear prescriber, such as an optometrist or ophthalmologist, that specifies the value of all parameters the prescriber has deemed necessary to construct and/or dispense corrective lenses appropriate for a patient.wikipedia
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Phoropter

competing versionsPhoroptor (phoropter)
The prescription is typically determined during a refraction, using a phoropter and asking the patient which of two lenses is better, or by automated refractor, or through the technique of retinoscopy.
It is commonly used by eye care professionals during an eye examination, and contains different lenses used for refraction of the eye during sight testing, to measure an individual's refractive error and determine his or her eyeglass prescription.

Autorefractor

automated refractorauto-refractorauto-refractors
The prescription is typically determined during a refraction, using a phoropter and asking the patient which of two lenses is better, or by automated refractor, or through the technique of retinoscopy.
An autorefractor or automated refractor is a computer-controlled machine used during an eye examination to provide an objective measurement of a person's refractive error and prescription for glasses or contact lenses.

Optician

opticiansdispensing opticianoptical engineer
A dispensing optician will take a prescription written by an optometrist or ophthalmologist and order and/or assemble the frames and lenses to then be dispensed and sold to the patient.
The parameters appraised by a lensometer are the sphere, cylinder, axis, add, and in some cases, prism.

Dioptre

diopterdioptersD
Every corrective lens prescription includes a spherical correction in diopters.
Optical power can also be used to adjust a basic prescription for reading.

Optometry

optometristoptometristsDoctor of Optometry
A dispensing optician will take a prescription written by an optometrist or ophthalmologist and order and/or assemble the frames and lenses to then be dispensed and sold to the patient. An eyeglass prescription is an order written by an eyewear prescriber, such as an optometrist or ophthalmologist, that specifies the value of all parameters the prescriber has deemed necessary to construct and/or dispense corrective lenses appropriate for a patient.

Near-sightedness

myopiamyopicnearsightedness
Divergent powers are negative (e.g., −3.75 D) and spread out light to correct for nearsightedness/short-sightedness (myopia).
During a refraction, an autorefractor or retinoscope is used to give an initial objective assessment of the refractive status of each eye, then a phoropter is used to subjectively refine the patient's eyeglass prescription.

Eye examination

eye exameye testexamination
The prescription is typically determined during a refraction, using a phoropter and asking the patient which of two lenses is better, or by automated refractor, or through the technique of retinoscopy. If an examination indicates that corrective lenses are appropriate, the prescriber generally provides the patient with an eyewear prescription at the conclusion of the exam.

Pupillary distance

interpupillary distanceinter-pupillary distancedistance between the left and right eyes
The parameters specified on spectacle prescriptions vary, but typically include the patient's name, power of the lenses, any prism to be included, the pupillary distance, expiration date, and the prescriber's signature.

Astigmatism

against the rule astigmatismastigmaticastigmatic myopic
Spherical lenses are adequate correction when a person has no astigmatism. Patients with astigmatism need a cylindrical lens, or more generally a toric lens to see clearly.

Corrective lens

corrective lensesreading glasseslenses
Corrective lenses are typically prescribed by an ophthalmologist or an optometrist.

Medical prescription

prescriptionprescriptionsprescribed
In all states, optometrists prescribe medications to treat certain eye diseases, and also issue spectacle and contact lens prescriptions for corrective eyewear.

Prism correction

prismPrism dioptrePrentice's rule
Eye care professionals use prism correction as a component of some eyeglass prescriptions.

Vertex distance

A phoropter measurement of a patient reads -8.00D sphere and -5.25D cylinder with an axis of 85° for one eye (the notation for which is typically written as -8 -5.25x85).

Ophthalmology

ophthalmologistophthalmicoculist
A dispensing optician will take a prescription written by an optometrist or ophthalmologist and order and/or assemble the frames and lenses to then be dispensed and sold to the patient. An eyeglass prescription is an order written by an eyewear prescriber, such as an optometrist or ophthalmologist, that specifies the value of all parameters the prescriber has deemed necessary to construct and/or dispense corrective lenses appropriate for a patient.

Retinoscopy

retinoscopedynamic retinoscopy
The prescription is typically determined during a refraction, using a phoropter and asking the patient which of two lenses is better, or by automated refractor, or through the technique of retinoscopy.

Far-sightedness

hyperopiahyperopichypermetropia
Convergent powers are positive (e.g., +4.00 D) and condense light to correct for farsightedness/long-sightedness (hyperopia) or allow the patient to read more comfortably (see presbyopia and binocular vision disorders).

Presbyopia

presbyopicnear pointFlexivue Microlens
Convergent powers are positive (e.g., +4.00 D) and condense light to correct for farsightedness/long-sightedness (hyperopia) or allow the patient to read more comfortably (see presbyopia and binocular vision disorders).

Binocular vision

binocularbinocular fusionbinocularity
Convergent powers are positive (e.g., +4.00 D) and condense light to correct for farsightedness/long-sightedness (hyperopia) or allow the patient to read more comfortably (see presbyopia and binocular vision disorders).

Optical axis

optic axisaxisaxial
A spherical lens has the same curvature in every direction perpendicular to the optical axis.

Cylindrical lens

cylindrical
Patients with astigmatism need a cylindrical lens, or more generally a toric lens to see clearly.

Toric lens

Toric
Patients with astigmatism need a cylindrical lens, or more generally a toric lens to see clearly.

Cornea