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|Bird Patterns (New)|
|Arm Pocket Clip|
|Wood Effect Frame|
|Different Strength Each Eye:|
+0.75 +1.25 +1.75 +2.25 +2.75 +4.0
|Blue Light Filter Lenses|
Before the correct glasses can be found, the dioptre value of the lenses must be determined. Associated with all reading glasses is the lens dioptre value. This value is a measure of the optical power of the lens. The optical power is the ability of the lens to converge or diverge incident light. A convergent lens of 1 metre focal length is said to have a power of +1 dioptre, a lens of 0.4 metre focal length has a power of +2.5 (1/0.4) dioptre. The usual convention is that convergent lenses are positive and divergent lenses negative. There are various methods for determining the dioptre value of reading glasses.
METHOD 1: To download a Word or PDF Test Chart, go to Downloads
METHOD 2: Dioptre value obtained from your Optical Prescription.
The two example prescriptions below indicate that, for single vision reading glasses, not bifocal or varifocal glasses, a lens dioptre value of +1.50 is required by both eyes. On some prescriptions O.D. means right eye and O.S. left eye.
|Right Eye:||Single vision reading dioptre = (Distance vision sphere dioptre) + ('Add' dioptre)|
|Left Eye:||Single vision reading dioptre = (Distance vision sphere dioptre) + ('Add' dioptre)|
|Right Eye:||Single vision reading dioptre = (-0.50) + (+3.00) = +2.50|
|Left Eye:||Single vision reading dioptre = (-0.25) + (+2.75) = +2.50|
It may also be necessary to incorporate cylinder correction into the reading lens.
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