How do I read my prescription

Prescription information

1. Right and left eye expression

The right eye is usually shown in front of the prescription, with the letters "R" or "O.D";The left eye is indicated by the English letter "L" or "o.s."

2. Main data of prescription

Ball mirror degree

A lens used to correct myopia or farsightedness.The spherical mirror is denoted by the English letter "S" or "SPH".The degree of spherical mirror is usually expressed by the English letter "D", a "D" is equivalent to 100 degrees of diopter.If there is a negative sign "-" before the degree of the spherical mirror, it is myopic.If there is a positive sign "+" before the degree of the ball mirror, it is far-sighted.

Example: the prescription reads "o.d.-2.50d", which means 250 degrees of myopia in the right eye.

(2) degree of column mirror

A column lens is a lens used to correct astigmatism.The columnar mirror is denoted by "C" or "CYL".Lens power is usually expressed by the English letter "DC" to buy a "DC" equivalent to 100 degrees of astigmatism.If there is a negative sign "-" before the column power, it is myopic astigmatism.If there is a positive sign "+" in front of the column power, it is hyperopic astigmatism.

Example: the prescription reads "o.cyl: +200DC", which means that the hyperopia of the right eye is 200 degrees astigmatism.

(3) bulk optical axis

The diffuser axis is used to indicate the direction of the refractive force of a diffuser mirror.The axial direction is 90° perpendicular to the scattered optical axis. The axial direction is represented by the English letter "A" or "AEX", which is represented by different data from 1° to 180°. The axial direction is 180° in the horizontal position and 90° in the vertical position.

(4) add light added value

The added value is the number of bifocals that people in their mid-40s wear in reading glasses.With the English letter "ADD".On the basis of the far lens, add a certain degree of lens used to look close, its focus in the far lens focus on the inside of the lower, also known as under add light.The lens attached below is always the hyperopia ball lens, usually from + 1.00d to + 3.50d.The maximum refractive power of bifocals when reading or looking close is "+ 2.25d".

Example: prescription "O.S: -4.00D s-2.00 D C×100°+1.75D" means that the left eye has myopia of 400 °, myopia of 200 ° and astigmatism of 200 °, the axial direction is close to the vertical direction of 100°, and the added value of the light added to presbyopia is hyperopia lens of 175 °.

(5) pd

Pupil distance shall be indicated by the letter "PD" in millimeters.When making glasses, the optical center of the lens will be determined according to the prescription distance of pupil distance.If the optical center of the lens is not accurate, it will cause eye discomfort, so the pupil distance is a very important data in the prescription of glasses.

Eye hospital of wuhan egger warm reminder: glasses is a medical practice, has a very strict standards and procedures, not blindly fitting, one thousand is not suitable for fitting the glasses, it is easy to lead to complications such as astigmatism, teenagers will cause inclined amblyopia in children, so to remind the broad masses of friends must pay attention to scientific eye, scientific glasses.To learn more about ophthalmology or to consult with an ophthalmologist, please call aeg ophthalmologist