What do the numbers on my glasses mean?
The numbers beneath the frames reflect the SIZE MEASUREMENTS in millimeters (mm). THE FIRST NUMBER (ex.54) = the width of the lenses. THE SECOND NUMBER (ex.15) = the distance between the lenses. THE THIRD NUMBER (ex.140) = the length of the temple arm including the portion going behind the ear.
What does 52 mean on glasses?
Answer: They’re size measurements in millimeters.
They’re measurements. The first number (e.g. 52), is the width of the lenses. The second number (e.g. 20) is the distance between the lenses. And the third number (e.g. 135) is the complete length of the temple arm, which includes the portion that goes behind your ear.
What are the 3 numbers on my glasses?
1) The eye size number (it is the size of the lenses on your frame). 2) The bridge size number (the distance between the lenses). 3) The temple length number (it is the size of that part of your eyeglass frame, which rests upon your ears).
Is minus 3 eyesight bad?
If the number has a minus (-) sign next to it, it means you’re nearsighted. A plus (+) sign or no sign means you’re farsighted. A higher number, regardless of whether there is a plus or minus sign, means you’ll need a stronger prescription.
What if PD is off by 2mm?
If the PD measured was 2mm off initially, by using a millimeter rule, the net cumulative error might be 4.5mm or more.
How do I find my PD on my glasses prescription?
Starting with the right eye, line up the zero end of the ruler at your pupil; measure the distance from your right to your left pupil. The millimeter number that lines up with your left pupil is the measurement you want. That number is your PD.
What happens if you don’t know your PD for glasses?
If your PD is off, the “optical center” of your lenses will be, too, and your glasses won’t be as effective as they should be. … Lots of optometrists will give you a copy of your prescription but not include your PD. That’s because they know that, armed with both, you can order your glasses online.
Is 0.75 eye prescription bad?
For both types, the closer you are to zero the better your vision is. For example, even though measurements of -0.75 and -1.25 both qualify as mild nearsightedness, the person with a spherical error of -0.75 is technically closer to 20/20 vision without their glasses on.
What does 1.25 glasses mean?
Reading glasses in the 1.25 range are for low to moderately-farsighted wearers. If strengths below 1.00 aren’t adequate, lenses in the 1.00-2.00 range should do the job. 2.25 reading glasses. 2.25 is a relatively high prescription for reading glasses.
How do I know if my frame is too big?
Your eyeglasses may be too big if they are always sliding down your nose or falling off your face. Your frames should align horizontally with your eyes and tilt slightly forward so the bottom of the frame is closer to the face than the top of the frame.
How do I know the size of my glasses?
The vast majority of glasses display the measurements somewhere on the frame. More often than not, you’ll find these numbers on the inside of the temple arms. The numbers, in order (from left to right), will refer to your current glasses lens width, followed by bridge width and the length of your temple.