How To Read Eyeglasses Spec Sheet

Your prescription may be written out on a blank rx pad instead of a pre made rx pad for eyeglasses only.

How to read eyeglasses spec sheet.

A number over 5 is generally considered to be on the stronger side. In the example above it is 2 00 1 75 0 25. How to read eyeglasses prescriptions when you look at a standard prescription the first word you ll see is distance this term refers to what power of lens you will need to see distant objects clearly. This number always has a sign.

For the left eye the calculation is 1 75 1 00 2 75 d s. Find the first 2 digit number to read your eye size. When you look at your prescription for eyeglasses you will see numbers listed under the headings of os and od. Os oculus sinister means the left eye and od oculus.

To determine which eye is which. J nv near vision your prescription is for reading only k pd pupillary distance the measurement in millimeters mm between both pupils l 75 0 75 m 125 1 25. The higher the number on your prescription the stronger your prescription is. So the prescription for reading glasses for the right eye would be 0 25 0 50 x 180.

The first step to understanding your eyeglass prescription is knowing what od and os mean. The type of rx glasses may be noted on a prescription such as dv distance vision nearsightedness and nv near vision reading. Some prescriptions may use r e. A number with a minus symbol before it means you are nearsighted and a number with a plus symbol or no symbol means you are farsighted.

Most prescriptions will include at least two rows of numbers one labelled o d. Using material data sheets for your design. 1 x research source. However you have to do a little algebra to figure the total power needed for single vision reading glasses.

This number measures the width of 1 lens spanning the distance at its widest point. Occasionally you may see a prescription with a line labeled o u or oculus uterque for both eyes. They are latin abbreviations. Your ophthalmologist or optometrist determines this power by trying different lenses while you read an eye chart in the exam.

Material data sheets provide an amazing amount of information at a glance but as with all types of engineering knowledge it takes background knowledge on what the numbers mean to interpret that data and a good engineer to evaluate the properties and choose the right material for a design.