Category 3 (all our sunglasses): 18-8% light transmission – Cat. 3 is a great all-around pair of sunglasses, which is why we use these on all our frames! These are good for sunny days and aren't going to be too dark in cloudy/overcast days.Aug 4, 2020
What does 3N mean on sunglasses?
Thus, the code 3N will mean they have standard lenses for use in high brightness environments. Standard (N) lenses are well, just standard, polarised (P) lenses are those that filter out horizontal light waves, helping reduce glare from large flat surfaces without loss of clarity of vision.
What do 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 +2.5 mean on glasses?
Eyeglass strength is measured in diopters. If your prescription reads -1.00, that means your eyeglasses need 1 diopter of strength to correct nearsightedness. If your prescription reads +2.50, your eyeglasses need 2.5 diopters of strength to correct farsightedness.Apr 12, 2021
What is the lowest power for reading glasses?
1.00 diopters
What is the strongest reading glasses?
The strongest reading glasses available are 4.00 diopters.
What magnification do reading glasses come in?
Prescriptions for reading glasses increase by 0.25 diopters, such as +1.00, +1.25, +1.50, and so on. However, for simplicity, some diopter charts may increase by 0.50 or by the whole number. Start by trying on reading glasses in the power that your test results yielded.
What are the 3 numbers on eye prescription?
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).Apr 29, 2020
What does 135 glasses mean?
Your glasses size is made up of 3 numbers that indicate measurements in millimeters, such as “45 20-135.” The first number will be the eye size, which measures the width of 1 lens. The second number indicates the bridge width, or the distance between the lenses.
How do I read my glasses size?
If you look on the inside of your glasses, you'll find a number that looks like: 52 18 135. This information shows you the size of your glasses; the lens diameter, the bridge width and the side length, all measured in millimetres. 1: The lens diameter is the width of the lens (in mm), measured from the bridge.
Is +2.5 a strong prescription?
If your number is between -0.25 and -2.00, you have mild nearsightedness. If your number is between -2.25 and -5.00, you have moderate nearsightedness. If your number is lower than -5.00, you have high nearsightedness.
What does +2.5 mean on reading glasses?
If you can read this, 2.75 is the proper strength for you. If you can read this, 2.50 is the proper strength for you. If you can read this, 2.25 is the proper strength for you. If you can read this, 2.00 is the proper strength for you.
Is 2.5 eye prescription bad?
Simply put, if your prescription is -2.5 or lower, this means that you are legally blind. Visual acuity of -2.5 is equivalent to 20/200 vision.