5.2.1.1 Single-vision and Multifocal Lenses
Vertical prismatic imbalance of mounted pairs of single-vision and multifocal lenses
with refractive power from 0.00 D to ±3.375 D in the vertical meridian shall not exceed
0.33Δ. Pairs with refractive power greater than ±3.375 D in the vertical meridian shall
not have more than 1.0 mm difference in the height of the two lenses prism reference
points. Measurement shall be done using the method specified in 8.5.1.
Horizontal prismatic imbalance between mounted single-vision and multifocal lenses
with refractive power from 0.00 D to ±2.75 D in the horizontal meridian shall not
exceed 0.67. The horizontal distance between the prism reference points of singlevision
and multifocal lenses with refractive power greater than ±2.75 D in the
horizontal meridian shall not differ from the specified distance interpupillary distance
by more than 2.5 mm. Measurement shall be done using the method specified in
8.5.2.
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