BTS Opticien-Lunetier key terms

A reciprocal-meter measure of optical power in the applicable model, requiring the corresponding distance and sign convention.

A prism measure linked to transverse displacement over a defined distance, distinct from an angular degree.

Variation of refractive behavior with wavelength that contributes to chromatic effects and is not determined by index alone.

The boundary angle in a specified higher-to-lower-index refraction model above which the ordinary transmitted-ray solution is absent.

The product or accumulated relationship of refractive index and geometric travel used in relevant wave and interference models.

A representation of the powers in the two principal meridians used to check a spherocylindrical prescription.

A lens power referenced to its rear surface and focal relationship, distinct from every equivalent-system power.

Frame or lens dimensions defined by a reference box and used with the actual fit and centration measurements.

A specified point at which prism is evaluated for the relevant lens design rather than any arbitrary marked location.

Mechanical loading introduced during assembly that may affect the lens and needs review under the actual material and frame procedure.

A change in the eye’s focusing state relevant to near vision, assessed with the person’s actual capacity and task.

The sphere plus half the cylinder in the stated representation, summarizing rather than reproducing all meridional correction.

A latent alignment tendency revealed when fusion is disrupted, interpreted with symptoms and the complete binocular assessment.

A lens-related oxygen transport measure involving permeability and thickness that does not guarantee freedom from every complication.

A symptom or finding requiring the appropriate medical or specialist pathway rather than routine optical adjustment alone.

Gross margin divided by the tax-exclusive selling price under the stated business definition, distinct from a cost-based margin rate.

Gross margin divided by the tax-exclusive purchase cost under the stated definition, not the selling-price-based rate.

Revenue remaining after variable costs within a supplied model, used with fixed costs in break-even analysis.

A regulated consumer-information document whose required content and coverage presentation follow the applicable French framework.

Information kept and used for defined lawful purposes with appropriate security, access and retention rather than indefinite unrestricted storage.