STEP 3: SELECT THE LENS INDEX (THICKNESS)
High prescription powers needs higher INDEX. As your prescription power increases, it makes the lenses thicker. Select the Correct lens Index that corresponds to your Prescription powers (sphere #) as recommended below for thinner & lighter lenses. Read more...
For the regular thickness lenses please select as recommended below or select A higher index for thinner lenses
How to Calculate reading power:
For prescriptions that do not have ADD#: The Sphere# (SPH) is your reading power.
For prescriptions with ADD#: If the Sphere# (SPH) is positive then add it to the ADD#.
If the Sphere# (SPH) is negative then subtract it from the ADD#.
If your OD (Right) or OS (Left) Reading power is from
1.50 Index 0.00 to +2.75
1.59 Index 0.00 to +4.75
1.60 Index +1.50 to +4.50
1.67 Index +3.75 to +6.75
1.74 Index +5.75 to higher
*Polycarbonate is highly recommended for kids, physical work, sports & for Half/Semi or full rimless frames.. Read more..