Optical Stores and Opticians Industry Terminology

Abbe Value

A measure of a lens material’s dispersion; lower Abbe values have more chromatic aberration (color fringing), higher Abbe values provide clearer peripheral vision.

- Choose Trivex (Abbe ~45) over polycarbonate (Abbe ~30) for patients sensitive to color fringing. - “The 1.74 lens is thinner but its lower Abbe could affect clarity off-axis.” - “His night-driving halos improved after switching to a higher-Abbe material.”

ADD (Near Addition)

The additional plus power applied to the near portion of a multifocal or progressive lens to aid near focusing, typically for presbyopes.

- “Her Rx is -2.00 sphere with a +2.25 ADD.” - “We lowered the ADD to +1.75 to improve intermediate vision at the computer.” - “Higher ADDs may need a wider near zone in the PAL design.”

ANSI Z80.1 (Rx Lens Tolerances)

U.S. standard specifying tolerances for prescription ophthalmic lenses, including sphere, cylinder, axis, prism, and thickness.

- “This lens failed ANSI Z80.1 axis tolerance; we need to remake it.” - “Final inspection checks prism within ANSI limits.” - “Our lab targets tighter-than-ANSI tolerances to reduce remakes.”

Anti-Reflective (AR) Coating

A multi-layer coating that reduces surface reflections to improve clarity, contrast, and cosmetics; often includes hydrophobic/oleophobic top coats.

- “AR improves night driving by cutting headlight glare.” - “We recommend oleophobic AR so smudges wipe off easily.” - “Blue-control AR can reduce perceived screen glare.”

Astigmatism

Refractive error caused by asymmetric corneal or lens curvature, corrected with cylinder power and axis in the prescription.

- “Rx shows -1.50 CYL at 180 for OD.” - “Toric contact lenses correct her astigmatism.” - “Axis changes of 10° can be noticeable at higher cylinder powers.”

B-Measurement (Frame B)

The vertical box dimension of a frame lens opening; important for lens selection and progressive fitting.

- “B is only 28 mm; choose a short-corridor PAL.” - “The B affects segment height range for bifocals.” - “A low B can limit reading area in progressives.”

Base Curve

The primary front surface curvature of a lens, influencing optics, fit, and cosmetics; matching original base curve helps maintain visual comfort.

- “Use a 6-base to match the patient’s old wrap sunglasses.” - “Steep base curves can increase peripheral distortion if not compensated.” - “Switching base curve eased her adaptation.”

Bifocal

A lens with distinct distance and near zones separated by a line or segment (e.g., Flat-Top 28, Executive).

- “He prefers an FT-28 bifocal for clear near.” - “Executive bifocals give the widest reading but are thicker.” - “We set the segment height at lower lid margin.”

Blue Light Filter

Lens treatment (tint or AR stack) that reduces short-wavelength (blue) light transmission; marketed for digital eye strain and glare mitigation.

- “Add blue-filter AR to her computer pair.” - “We explained blue filters don’t treat disease but can improve comfort.” - “Choose a subtle, low-color-shift option.”

CAC (Customer Acquisition Cost)

Total marketing and sales cost to acquire one new eyewear customer or patient.

- “Our CAC fell after launching referral credits.” - “Compare CAC to LTV to decide ad spend.” - “Insurance referrals lowered CAC by 20%.”

Capture Rate

Percentage of exams where the patient purchases eyewear or lenses from the same location.

- “Raising capture rate from 55% to 70% boosts revenue without more exams.” - “Improve capture with same-day quotes and frame styling.” - “Track capture by provider to spot training needs.”

CR-39

A common 1.50 index plastic lens material (allyl diglycol carbonate) known for optical clarity and high Abbe value, but thicker/heavier than high-index.

- “CR-39 is great for low Rx with tight budgets.” - “Not ideal for drill mounts due to brittleness.” - “Add a hard coat; base material scratches easily.”

Cylinder (CYL)

The amount of astigmatic correction in diopters; paired with an axis to denote orientation.

- “-2.00 CYL at 175 indicates high astigmatism.” - “Be mindful switching from plus- to minus-cylinder notation.” - “Axis errors impact clarity more at higher CYL.”

DBL (Distance Between Lenses)

The frame’s bridge size, measured as the distance between the boxed lens shapes; often shown as A-DBL-temple (e.g., 52-18-140).

- “Try a smaller DBL to improve bridge fit.” - “52-18-140 means A=52, DBL=18.” - “DBL affects decentration and lens thickness.”

Decentration

Shifting the lens optical center relative to the frame’s geometric center to align with the wearer’s PD and fitting height; affects induced prism and edge thickness.

- “Use decentration = (frame PD – patient PD)/2 per eye.” - “High decentration increases edge thickness in minus lenses.” - “Minimal decentration keeps cosmetics better.”

Diopter (D)

Unit of refractive power; the reciprocal of focal length in meters.

- “A -3.00 D lens focuses at -0.333 m.” - “Increase ADD by +0.25 D for closer reading.” - “Over-refraction changed by -0.50 D.”

Digital Surfacing (Freeform)

CNC-controlled, point-by-point surfacing that creates customized lens optics (often on the back surface) to improve fields of view and reduce aberrations.

- “Freeform PALs give wider intermediate.” - “Wrap compensation is built into digital designs.” - “Uses wearer parameters like vertex and tilt.”

Dispensing

The professional process of fitting, adjusting, instructing, and delivering eyewear to the patient.

- “Schedule a 20-minute dispensing for progressives.” - “Document frame adjustments at dispense.” - “Dispensing includes care, cleaning, and warranty education.”

ECP (Eye Care Professional)

Umbrella term for opticians, optometrists, and ophthalmologists.

- “Partner with local ECPs for referrals.” - “ECP training improved capture rate.” - “Invite ECPs to new frame line launches.”

Edging and Blocking

Lab finishing steps where a lens is blocked (secured) and edged (cut) to the frame shape, then inserted.

- “Slippage during blocking caused axis error.” - “We edged to a +0.10 mm size for a tight fit.” - “Use hydrophobic pad stacks for slick AR lenses.”

EHR/EMR (Electronic Health Record)

Digital patient records that store clinical, prescription, insurance, and lifestyle data; often integrated with practice management.

- “EHR flags recall dates for annual exams.” - “EMR integrates e-prescribing and billing.” - “Secure messaging must be HIPAA-compliant.”

Eye Size (A Measurement)

The horizontal boxed lens dimension of a frame; key in frame sizing and lens thickness calculations.

- “Frame is 54-16-145; A is 54 mm.” - “Smaller A reduces minus lens edge thickness.” - “A impacts minimum blank size needed.”

Face-Form Angle (Wrap)

The horizontal curvature of the frame front relative to the face; affects optics, cosmetics, and field of view.

- “Increase face-form for sunwear coverage.” - “High wrap requires compensated Rx in freeform.” - “Excess wrap can induce unwanted prism if not designed in.”

Fitting Height

Vertical measurement from a reference point (often pupil center) to the lowest part of the lens for setting segment or fitting cross, especially in PALs.

- “Measure fitting height with the chosen frame on-face.” - “Short-corridor PALs work with lower heights.” - “Pantoscopic tilt influences effective fitting height.”

Gross Margin

Sales minus cost of goods sold (COGS), as a percentage; key profitability metric for frames and lenses.

- “Private-label frames lift gross margin.” - “Track margin by vendor to guide buys.” - “Bundling AR and photochromic can improve margin.”

HIPAA Compliance

Adhering to U.S. regulations protecting patients’ health information (PHI) in storage, transmission, and access.

- “Encrypt emails containing Rx details.” - “Limit staff access to PHI in the PMS/EHR.” - “Shred old facesheets with identifiable data.”

High-Index Lenses

Lens materials with refractive index higher than standard plastics (e.g., 1.60, 1.67, 1.74) that reduce thickness/weight at the expense of lower Abbe values.

- “Recommend 1.67 for -6.00 D to slim edges.” - “Warn about potentially more color fringing.” - “High-index may not be ideal for drill mounts.”

Hyperopia

Farsightedness; the eye focuses images behind the retina; corrected with plus-power lenses.

- “Her +3.00 D hyperopia needs high-index to keep lenses thin.” - “Full-time wear improves near comfort.” - “Consider aspheric designs for better cosmetics.”

Insurance Verification

Confirming eligibility, benefits, copays, allowances, and authorizations with vision plans before ordering.

- “Verify benefits with the plan portal before the exam.” - “Check if AR is covered or out-of-pocket.” - “Pre-authorize medically necessary contacts.”

Inventory Turnover

How many times inventory sells and is replaced over a period; calculated as COGS divided by average inventory.

- “Target 4–6 turns annually for frames.” - “Cull slow-moving SKUs to boost turnover.” - “Use sell-through data to plan reorders.”

Job Tray/Job Ticket

Physical tray and documentation that track each eyewear order through the lab workflow.

- “Barcode job tickets to reduce lost work.” - “Tray 14 has the drill-mount sunglasses.” - “Include fitting heights and PD on the ticket.”

KPI (Key Performance Indicator)

Quantifiable metrics that track business performance (e.g., capture rate, redo rate, AOV, margin).

- “Weekly KPI huddle reviews capture and remakes.” - “Set KPI targets by provider.” - “Dashboards visualize KPI trends.”

Lens Index (Refractive Index)

Ratio describing how much a material bends light; higher index allows thinner lenses for the same power.

- “Compare 1.50 vs 1.67 thickness for -5.00 D.” - “Index affects base curve choices.” - “Higher index often pairs with lower Abbe.”

Lensometer (Vertometer)

Instrument used to verify sphere, cylinder, axis, prism, and optical center of lenses; also marks optical centers.

- “Neutralize the old lenses to duplicate PD.” - “Spot the PAL fitting cross with the lensometer grid.” - “Verify prism within ANSI tolerance.”

LTV (Customer Lifetime Value)

Projected net profit from a customer across the relationship, factoring repeat eyewear, exams, and referrals.

- “Annual plans increase LTV.” - “Compare LTV to CAC to guide marketing.” - “Retention programs raise LTV.”

Managed Vision Care

Insurance/benefit networks that contract rates, allowances, and reimbursements for exams and eyewear.

- “Know each plan’s AR allowance.” - “Pre-authorize specialty lenses when required.” - “Balance-plan and private-pay mix for profitability.”

Myopia

Nearsightedness; the eye focuses images in front of the retina; corrected with minus-power lenses.

- “-4.00 D myope benefits from high-index.” - “Edge thickness rises with greater minus power.” - “Discuss myopia management for young patients (with OD).”

Non-Adapt Rate

Percentage of patients who cannot adapt to a new lens type or design (often PALs) and require a change.

- “Track non-adapts by design to refine offerings.” - “Our policy: no-charge non-adapt within 60 days.” - “Lower non-adapt rate via better pre-qualifying.”

OD/OS/OU

Prescription abbreviations: OD (right eye), OS (left eye), OU (both eyes).

- “OD: -2.00 -1.00 x180; OS: -1.50 -0.75 x175.” - “Order OU AR but a sun clip for OD only.” - “Chart notes must separate OD and OS data.”

Omnichannel Retail

Integrated in-store and online experience for browsing, booking, purchase, and aftercare.

- “Offer virtual try-on and in-store pick-up.” - “Sync PD and Rx to the customer’s account.” - “Curbside adjustments keep omnichannel seamless.”

Occupational Lenses

Task-specific designs optimized for intermediate/near work (e.g., office/computer lenses, Double-D).

- “Recommend office PAL for programmers.” - “Double-D works for mechanics needing up/down near zones.” - “Increase intermediate width for dual monitors.”

Optical Center (OC)

Point on the lens with no prism effect; aligned horizontally with PD and vertically per fitting requirements.

- “Set OC height for single vision at pupil center.” - “OC placement impacts induced prism.” - “Compensate OC for pantoscopic tilt when required.”

PAL (Progressive Addition Lens)

A multifocal lens with a gradual increase in plus power from distance to near, without visible segment lines.

- “Choose a short corridor for small B-size frames.” - “Align the fitting cross at the pupil center.” - “Design choice affects swim and peripheral blur.”

Pantoscopic Tilt

The angle of the frame front relative to vertical, with bottom tilted toward the cheeks; influences effective power and fitting height.

- “Aim for ~8–12° pantoscopic tilt for most fittings.” - “Adjust tilt to improve near zone access.” - “Compensate Rx/fitting for significant tilt.”

Photochromic Lenses

Lenses that darken with UV exposure and lighten indoors; available in multiple colors and materials.

- “Great for patients moving between indoors and outdoors.” - “Note reduced activation behind many car windshields.” - “Combine with AR for best clarity.”

Polarized Lenses

Sun lenses with a filter that blocks horizontally polarized glare, improving comfort and contrast.

- “Ideal for driving, boating, and snow.” - “Angled displays may look dim due to polarization.” - “Add backside AR to reduce reflections.”

Polycarbonate

Impact-resistant lens material (n≈1.586, low Abbe) commonly used for children, sports, and safety eyewear; inherently blocks UV.

- “Recommend poly for kids and safety glasses.” - “Lower Abbe—some may notice color fringes.” - “Great for drill-mount durability vs CR-39.”

Prism Diopters (Δ)

Unit measuring prism power; 1Δ shifts an image 1 cm at 1 m. Used to correct binocular vision issues or to offset induced prism.

- “Rx calls for 2Δ base out OU.” - “Excess decentration can create unwanted prism.” - “Verify prism at the PRP per ANSI.”

Pupillary Distance (PD)

Distance between the visual axes (pupils), measured binocularly or monocularly; critical for aligning lens optical centers.

- “Monocular PDs: 31/32 mm at distance.” - “Use near PD for reading-only glasses.” - “Incorrect PD can cause eyestrain and prism.”

Quality Control (QC)

Systematic inspection of finished eyewear to verify Rx, measurements, cosmetics, mounting, and adherence to standards before dispensing.

- “QC caught a +0.50 D sphere error.” - “We check alignment, torque, and screw tightness in QC.” - “QC logs help track remake root causes.”