V. Interpret your own optometry sheet  including degree and Pupillary distance

1. Representation of the degree of eyeglass:

OD or RE or R:The right eye;

OS or LE or L:The left eye;

OU or BE:The eyes;

Add:The addition of luminosity, presbyopia, bifocals and progressive  lenses;

S : Spherical lens, (-) for myopia and (+) for hyperopia or presbyopia;

C :Cylindrical lens, used for astigmatism;

DS :Focal power of the spherical lens;

DC :Focal power of the cylindrical lens;

AXIS:The axis of the cylinder lens. The astigmatism axis takes the angle  between the cylinder axis and the horizontal line as the standard, and is  currently marked by TABO labeling method, where the horizontal  dimension is not called 0°, but 180°.

PD(Pupillary distance):The distance measured in millimeters  between the centers of the pupils of the eyes;

PH (Pupil Height) : The height measured in millimeters of the pupil  center on the lens.

Prism Degree Notation:

P:Prism unit of triple prism(△)

B:The direction of the prism base

BI:Basal inward (base near the nasal side)

BO:Basal outward (base near the temporal side)

BU:Basal upward

BD:Basal downward

Examples of prescription for glasses:

R: -2.50DS/-0.75DC*173,

L: -3.00/ 1.00*4, PD: 63mm, ADD+2.25DS

The above prescription indicates that the right eye is 250 degrees  myopia with -75 degrees astigmatism, and the astigmatism axis is at 173  degrees, while the left eye is 300 degrees myopia with -100 degrees  astigmatism, and the astigmatism axis is at 4 degrees. The pupillary  distance is 63 mm.ADD is marked on the optometry sheet, which means  that the patient needs to wear the corresponding +225 degrees to  correct the near-sightedness, that is, the degree of presbyopia is 225  degrees.

Measure your own PD

Classification of myopia degree:

Choose the corresponding spectacle frame according  to your own degree:

High/Super high myopia

Plate or metal frame is recommended. The higher the  degree, the thicker the lens, so people with high myopia are  not recommended to choose a large frame, which is  unbeautiful and heavy. It is recommended to choose a small  frame. High myopia is affected by lens thickness. You can  choose the full-rim frame to cover part of the thick lens and  improve the overall appearance.At the same time, the frame  should be a little heavier, and the nose pad should be able to  hold it, to avoid the slide caused by the weight imbalance  between the front and back of the frame. Also choose a  frame with a large nose pad to increase the force area and  reduce the indentation of the glasses. It is not recommended  to use frames without nose pads as heavy lens can slip too  easily.

2. Choose the right spectacle frame according to  your pupillary distance

The pupillary distance is small,Since the lens needs to be  processed by shifting the center, it is recommended to  choose a wide frame with small lens ring to avoid  insufficient shifting of the lens, which may cause a larger  pupillary distance and uncomfortable wearing.

The distance between the eyes is small,You can use the  frame that is light-colored at     the bridge of the nose and  gradually darkens toward the glass leg. The reverse is true  for wide eye distance.

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