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Virginia Administrative Code
Title 18. Professional And Occupational Licensing
Agency 80. Board For Hearing Aid Specialists And Opticians
Chapter 30. Opticians Regulations
11/5/2024

18VAC80-30-120. Lenses and frames standards.

A. Power Tolerance (diopters).

Sphere: Plano to ±.6.50

±.13 diopter

Above ±.6.50

±2%

Cylinder: Plano - 2.00

±.13 diopter

-2.12 to -4.50

±.15 diopter

above -4.50

±4%

B. Cylinder Axis.

Cyl. Power Diopters

Degrees ±

0.12 - 0.37

0.50 - 0.75

0.87 - 1.50

1.62 and above

C. Distance Optical Center. Contribution to net horizontal prism from processing should not exceed 2/3 prism diopter. A maximum of ±2.5mm variation from the specified distance optical center is permissible in higher power lens combinations.

D. Prism Tolerances (Vertical). Contribution to imbalance from processing should not exceed 1/3 prism diopters. A maximum of 1.0mm difference in vertical level is permissible in higher power lens combinations.

E. Segment Location.

Vertical

±.1.0 mm

Horizontal

±.2.5 mm

Tilt or twist in the case of a flat-top segment, the tilt of its horizontal axis should be less than 1/2 mm in differential elevation between the segment edges.

F. Multifocal Additions.

Plano + 8.00

±.13 diopter

Above + 8.00

±.18 diopter

G. Base Curve. When specified, the base curve should be supplied within ±0.75 diopter.

H. Warpage. The cylindrical surface power induced in the base curve of a lens should not exceed 1 diopter. This recommendation need not apply within 6mm of the mounting eyewire.

I. Localized errors (aberration). Areas outside a 20mm radius from the specified major reference point or optical center need not be tested for aberration. Progressive lenses are exempt from this requirement.

Statutory Authority

§ 54.1-201 of the Code of Virginia.

Historical Notes

Former 18VAC100-20-85 derived from Virginia Register Volume 17, Issue 9, eff. March 1, 2001; amended and renumbered as 18VAC80-30-120, Virginia Register Volume 28, Issue 23, eff. August 15, 2012.

Website addresses provided in the Virginia Administrative Code to documents incorporated by reference are for the reader's convenience only, may not necessarily be active or current, and should not be relied upon. To ensure the information incorporated by reference is accurate, the reader is encouraged to use the source document described in the regulation.

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