{"data":{"id":"us-va/18vac80-30-120","jurisdiction":"us-va","citation":"18VAC80-30-120","heading":"Lenses and frames standards","body":"A. Power Tolerance for single vision and multifocal lenses (diopters).\n\nSphere: Plano to ±6.50\n\n± 0.13 diopter\n\nStronger than ±-6.50\n\n±2.0%\n\nCylinder: Plano to -2.00\n\n± 0.13 diopter\n\n\u003e -2.00 to -4.50\n\n± 0.15 diopter\n\nGreater than -4.50\n\n±4.0%\n\nB. Power tolerance for progressive addition lenses (diopters).\n\nSphere: Plano to ±8.00\n\n±0.16 diopter\n\nStronger than ±8.00\n\n±2.0%\n\nCylinder: Plano to -2.00\n\n±0.16 diopter\n\n\u003e -2.00 to -3.50\n\n±0.18 diopter\n\nGreater than -3.50\n\n±5.0%\n\nC. Cylinder axis.\n\nCyl. Power Diopters\n\nDegrees\n\n-0.12 to -0.25\n\n±14°\n\n\u003e-0.25 to -0.50\n\n±7.0°\n\n\u003e-0.50 to -0.75\n\n±5.0°\n\n\u003e-0.75 to -1.50\n\n±3.0°\n\nGreater than -1.50\n\n±2.0°\n\nD. Prism reference point location and power tolerances. The prismatic power measured at the prism reference point should not exceed 1/3 prism diopters or the prism reference point shall not be more than 1.0 mm away from its specified position in any direction.\n\nE. Prismatic imbalance tolerance in mounted single vision and multifocal eyewear.\n\nRefractive Power\n\nTolerance\n\nPlano to ±3.375D\n\nNo more than 0.33 prism diopters vertically\n\nGreater than ±3.375D\n\nNo more than 1.0 mm difference in height of PRP\n\nPlano to ±2.75D\n\nNo more than 0.67 prism diopters horizontally\n\nGreater than ±2.75D\n\nNo more than 2.5 mm from specified interpupillary distance\n\nF. Prismatic imbalance tolerance in mounted progressive addition lens eyewear.\n\nRefractive Power\n\nTolerance\n\nPlano to ±3.375D\n\nNo more than 0.33 prism diopters vertically\n\nGreater than ±3.375D\n\nNo more than 1.0 mm difference in height of PRP\n\nPlano to ±3.375D\n\nNo more than 0.67 prism diopters horizontally\n\nGreater than ±3.375D\n\nNo more than 1.0 mm from specified monocular pupillary distance\n\nG. Segment and fitting cross vertical location and segment tilt.\n\nMultifocals:\n\nTolerance\n\nSegment height for each lens\n\n±-1.0 mm\n\nDifference between segments heights in mounted pair\n\n±1.0 mm\n\nProgressive Addition Lenses:\n\nFitting Cross height for each lens\n\n±1.0 mm\n\nDifference between fitting cross heights in mounted pair\n\n±1.0 mm\n\nHorizontal tilt for each lens using permanent reference\n\nmarkings\n\n±2.0 degrees\n\nH. Multifocal and Progressive Addition Lens Addition Power Tolerances.\n\nNominal Value of Addition Power\n\n0.00 to ±4.00D\n\n+4.00D and above\n\nTolerance on Addition Power\n\n±0.12\n\n±0.18\n\nI. Base curve tolerance. When specified, the base curve should be supplied within ±0.75 diopter.\n\nJ. Center thickness tolerance. When specified, the center thickness should be within ±0.3 mm measured at the prism reference point of the convex surface.\n\nK. Localized errors (aberration). Areas outside a 30mm diameter from the distance reference point or within 6mm from the edge need not be tested for local power errors or aberrations. Progressive addition lenses are exempt from this requirement.\n\nL. Prescription dress eyewear impact resistance. All lenses must conform to the impact resistance requirements of 21 CFR 801.410.\n\nM. Axis of polarization. The actual plan of transmittance shall be at 90 ± 3.0 degrees from the intended direction of horizontal orientation of polarization marking.","path":["Title 18. Professional And Occupational Licensing","Agency 80. Board For Hearing Aid Specialists And Opticians","Chapter 30. Opticians Regulations","Part IV. Reinstatement"],"source_url":"https://law.lis.virginia.gov/admincode/title18/agency80/chapter30/section120/","current_through":"2026 Regular Session (effective July 1, 2026)","vintage":"","retrieved_at":"2026-09-14T04:52:43Z","sha256":"e89a66ae975969df0676dead0894dc87d7f98200014cb9c3218a7b7212570e06","source_id":"us-va-vac","stale":false,"prev":"us-va/18vac80-30-110","next":"us-va/18vac80-30-130"},"notice":"GroundRules: Original legal text. Not legal advice."}