Upload sample prescription sign
How to measure pupillary distance (Tutorial link)
Contact LINE online customer service (link)
The first step in getting glasses is an eye exam. MISSU21 can then tailor your prescription based on your eye exam data. So how do you get a prescription? We recommend visiting an eye clinic or optometrist near your home to get your prescription.
After receiving your prescription, are you overwhelmed by the dense array of English terms and numbers? Don't worry, let me briefly explain the data on the prescription so you can quickly and accurately enter your vision readings in the "Enter Prescription" section, making your glasses prescription experience smoother on the MISSU21 website!
Let’s take a closer look…
S=SPH=Spherical degree
Lens power, measured in diopters (D), refers to the prescription used to correct nearsightedness or farsightedness. If the number appears with a minus sign (–), you have nearsightedness; if the number appears with a plus sign (+) or without a plus or minus sign, you have farsightedness. The spherical power is generally converted to 4.00 * 100 = 400 degrees. Since most people are nearsighted, the number is marked with a (-). Please be careful not to make a mistake when entering the power.
C=CYL=cylindrical power=astigmatism
Cylinder = astigmatism, which means that the added power of the lens for correcting astigmatism is aspherical, and its shape makes one axis have no added curvature, while the other axis perpendicular to this "no added" axis has the maximum power and mirror curvature to correct astigmatism.
If the number in the astigmatism column is preceded by a minus sign (–), it corrects for nearsighted astigmatism; if it is preceded by a plus sign (+), it corrects for farsighted astigmatism. The astigmatism degree is always written after the spherical power on your prescription. If there is no number in this column, you have no astigmatism or your astigmatism is so mild that no actual correction with eyeglass lenses is needed.
A=AXIS=Axis of astigmatism
The axis of astigmatism describes the lens axis without any astigmatism correction. The axis of astigmatism is defined as a number between 1 and 180. 90 corresponds to the vertical axis of the eyeball, while 180 corresponds to the horizontal axis of the eyeball.
If you have astigmatism, your prescription must include the axis of astigmatism. This value should be written after the astigmatism number. The axis of astigmatism is the axis of the lens that is 90 degrees from the axis containing the astigmatism number.
PD = pupil distance
Interpupillary distance (IPD) measures the distance between the pupil centers. It's used to ensure your pupils are aligned accurately with the center of vision in your lenses. The more accurate the alignment, the clearer your vision! Generally, the interpupillary distance between your left and right eyes is equal to PD/2. You can also measure the PD value yourself at home.
The pupillary distance (PD) refers to the distance between the centers of your pupils. This distance is known as the PD (Pupillary Distance) value. Because every set of prescription lenses has an "optical center," this distance is determined by the pupillary distance. This distance determines where you see through your glasses. The more accurate the PD, the clearer your vision! There are two simple ways to measure your PD at home. You can easily obtain your PD value and get your glasses online, making fitting more convenient.
