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The first step in getting glasses is to have your eyes checked. Only then can MISSU21 make your own comfortable glasses based on your eyesight data. So how do you get a prescription for glasses? We recommend that you go to an eye clinic or optometry office near your home and get a prescription.
After getting the prescription, does it make your head spin when you see the dense English nouns and numbers on it? Don’t worry, let me briefly introduce the data on the prescription pad, so that you can quickly and correctly fill in the vision degree in "Enter Prescription", making it smoother for you to get glasses on the MISSU21 website!
Let’s find out more…
S=SPH=spherical power
Lens power, measured in diopters (D), is the prescription used to correct nearsightedness or farsightedness. If the number appears with a minus sign (–), it means you have myopia; if the number has a plus sign (+) or without a plus sign or minus sign, it means you have hyperopia. The spherical degree is generally converted to 4.00* 100=400 degrees. Most people who wear glasses are myopic, so the numbers are marked (-). Please be careful not to make mistakes when filling in the degree.
C=CYL=cylindrical power=astigmatism power
Cylindrical power (cylinder) = astigmatism power, which means that the addition degree of the lens to correct astigmatism is aspherical, and its shape is such that one axis has no added curvature, and the other axis perpendicular to this "no added degree" axis has Maximum power and mirror curvature to correct astigmatism.
If there is a minus sign (–) in front of the number in the astigmatism power column, it is used to correct myopic astigmatism; if there is a plus sign (+), it is used to correct farsighted astigmatism. The astigmatism degree is always written after the spherical degree of the prescription. If there are no numbers in this column, it means you have no astigmatism or your astigmatism is so slight that it does not require actual correction through spectacle lenses.
A=AXIS=Axis of astigmatism
Astigmatism axis (Axis) indicates that the lens axis does not include any astigmatism power used to correct astigmatism. The axis of astigmatism is defined as a number between 1 and 180. The number 90 is exactly the vertical axis of the eyeball, and the number 180 is exactly the horizontal axis of the eyeball.
If you have astigmatism, the axis of astigmatism must be filled in on the prescription. This value is written after the astigmatism degree. Astigmatism axis is the lens axis that is 90 degrees from the axis containing the astigmatism power.
PD=pupillary distance
Interpupillary distance, or pupillary distance, measures the distance between the centers of the pupils. It is used to determine that the pupils of your eyes can accurately align with the visual center point of the lens. The more accurate it is, the clearer the vision! Generally, the interpupillary distance of the left and right eyes is equal to PD/2. The PD value of the interpupillary distance can also be measured at home~
Pupillary distance (pupillary distance) refers to the distance between the centers of the pupils of the two eyes, and the value of this distance is the PD (Pupillary Distance) value. Because each set of prescription lenses has an "optical center," which is determined by the pupillary distance and is used to determine where you see through your spectacle lenses, the more accurate it is, the clearer your vision will be! There are two simple methods for measuring interpupillary distance at home. You can easily obtain the PD value and wear glasses online, making it more convenient to wear glasses.
