What does D mean on contact box?

E.g. DIA 13.8. Power (pwr) / Sphere (sph) / Dioptre (D): This value is the power of the lens needed to correct your long or short-sightedness and is measured in Dioptres (D). A minus (-) sign indicates that you are short-sighted, whereas a plus (+) sign shows that you are long-sighted.

What does the negative number on contacts mean?

myopia
SPHAlso referred to as Power or PWR, this field references the corrective factor of the contact lenses. A negative number, such as -2.25, in this field indicates myopia, (nearsightedness), while a positive number like +2.25 indicates hyperopia (farsightedness).

What are the numbers on the box of contact lenses?

Most of the time you’ll see 8.6 or 8.8 on your box of lenses. Similar in theme is the diameter measurement, seen on your box as DIA. Again, not all eyes are shaped the same, and some people find that their contact lenses are more comfortable with specific diameters. Also measured in millimeters, common diameters are around 14.2.

How to read your contact lens power number?

Just look around for your power number, you are bound to find it. Reading contact lens prescriptions can be daunting; understanding them can be more so. The prescription should unfold in the following way: Eye, Power , BC, Dia and Brand. The second 20 is the distance a normal eye can see at the test-20 feet.

How to read your contact lens prescription or rx?

Below are the definitions of the symbols/abbreviations used in a typical contact lens prescription: Eye – Which eyes the prescription line item is for. Brand – The brand name or type of contact lens that your Eye Care Provider has fitted you for. Astigmatism is blurred vision and is caused by an eye that is not completely round.

Why do I have different contact lens prescriptions?

If there is a plus sign before the number, you are farsighted (you have hyperopia.) The further the number is from zero, the stronger your prescription. It is common to have a different prescription in each eye. BC: Base Curve – this refers to the back curvature of the contact lens, measured in millimeters.