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Segment Height, also known as Seg Height or SH, is the vertical measurement in millimeters
from the bottom of the lens in your frames to the center of the pupil.
Sphere (SPH) - the amount of lens power
Cylinder (CYL) - This indicates the amount of astigmatism.
If nothing appears in this column or if it is DS, means you have no astigmatism
AXIS - If an eyeglass prescription includes cylinder power,
it also must include an axis value, which follows the CYL power and is preceded by an 'x'.
ADD - magnifying power applied to the bottom part of multifocal lenses, s always a + power.
The distance between the centre of one pupil
to the centre of the other pupil is the PD.
Prescription glasses are made so that the distance
between the optical centres of the glasses' lenses,
is the same as your PD.
Most Prescription Don't Have this/
Your prism helps your eyes to work together more comfortably by correcting their muscle balance.
If you have a prism correction, you will also have a base direction that will state one of the following - Up, Down, In or Out.
Down might be indicated by ‘DN’
You might have more than one Prism value per eye.
You will have a Base direction for each Prism correction.
The example below shows the prism required for distance.
You will use the H-Near and V-Near prism for reading as this might be different from your distance prism.
Our standard 1.56 Index plastic lenses; works best for low prescriptions ranging from -3.00 to +3.00. For higher prescriptions we recommend that you upgrade your lens.
Our standard CR-39 plastic lenses; works best for low prescriptions ranging from -2.00 to +2.00. For higher prescriptions we recommend that you upgrade your lens package.
Up to 40% thinner than the basic 1.5 index lenses; these are an optimal choice for moderate to high prescriptions ranging from -8.00 to +6.00.
Up to 60% thinner than the basic 1.5 index lenses; these are an optimal choice for moderate to high prescriptions ranging from -16.00 to +8.00.
Most Impact Resistant Material, Recommended for Sports & Kids Eyewear. Polycarbonate Lenses have index value of 1.598, Up to 25% thinner than the standard 1.5 index lenses, a great choice for prescriptions ranging from -4.00 to +4.00.
80% tint on top for distance, fades to a very light tint 20% tint at the bottom for reading.
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