How To Read Eyeglasses Spec Sheet

This number always has a sign.

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. In the example above it is 2 00 1 75 0 25. Your ophthalmologist or optometrist determines this power by trying different lenses while you read an eye chart in the exam. They are latin abbreviations.

Some prescriptions may use r e. This number measures the width of 1 lens spanning the distance at its widest point. Your eyes size is the only measurement that falls between 40 to 60 millimetres 1 6 to 2 4 in so you can use this range to ensure that you re reading the correct number. Os oculus sinister means the left eye and od oculus.

For multi focal glasses as well as reading and computer glasses your rx will include an add or nv value. Occasionally you may see a prescription with a line labeled o u or oculus uterque for both eyes. 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. So the prescription for reading glasses for the right eye would be 0 25 0 50 x 180.

The type of rx glasses may be noted on a prescription such as dv distance vision nearsightedness and nv near vision reading. Using material data sheets for your design. 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. Find the first 2 digit number to read your eye size.

However you have to do a little algebra to figure the total power needed for single vision reading glasses. They are abbreviations for oculus dexter and oculus sinister which are latin terms for right eye and left eye your eyeglass prescription also may have a column labeled ou. 1 x research source. 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.

The first step to understanding your eyeglass prescription is knowing what od and os mean. A number over 5 is generally considered to be on the stronger side. To determine which eye is which. Most prescriptions will include at least two rows of numbers one labelled o d.

For the left eye the calculation is 1 75 1 00 2 75 d s.