Free NOCE Exam Flashcards

Add sphere and cylinder for the new sphere, reverse the cylinder sign, and rotate the axis 90 degrees while keeping it between 1 and 180.

It converges the rays toward a focal point and is thickest at the center.

It diverges the rays as if they came from a focal point and is thickest at the edge.

The meridian with no cylinder power; the full cylinder power acts 90 degrees away.

Sphere power plus one-half of the cylinder power. It summarizes average refractive power but does not replace the full prescription.

Induced prism in prism diopters: lens power in diopters multiplied by decentration in centimeters.

At the prism reference point specified for verification; it may differ from the fitting cross or distance reference point.

A given prescription can be made with flatter curves and less lens thickness than a lower-index material, all else equal.

A material's chromatic dispersion. A lower Abbe value means greater color fringing away from the optical center.

Changing the lens-to-eye distance changes effective power at the cornea, so compensation may be needed.

A meaningful difference in refractive power between the two eyes.

A difference in perceived image size or shape between the eyes, sometimes associated with anisometropia or lens magnification differences.

Different vertical prism effects between the eyes when the wearer looks below the distance optical centers, often in dissimilar prescriptions.

It supplies most of the eye's refractive power and begins focusing incoming light.

It fine-tunes focus and changes shape during accommodation for different viewing distances.

A refractive condition in which distant light focuses in front of the retina when accommodation is relaxed; minus power corrects it.

A refractive condition in which light would focus behind the retina without accommodation; plus power corrects it.

The age-related reduction in accommodation that makes near focusing harder and may require added plus power.

It reduces surface reflections, improving light transmission, appearance, and visual comfort, especially in demanding lighting.

Glare from predominantly horizontally polarized light reflected by surfaces such as roads and water.

They darken with activating radiation, primarily ultraviolet, and lighten when that exposure decreases; performance varies with conditions.

A multifocal lens with a gradual power change from distance through intermediate to near and no visible segment line.

A segmented multifocal with a visible near zone whose top is flat, providing distance and near powers.

Lens opening size with the A measurement, B measurement, and distance-between-lenses value.

The standardized length from the hinge area along the temple to its end, measured by the specified frame convention.

It offers high impact resistance and low weight, though material optics and coating needs should also be considered.

It can reduce thickness, weight, magnification effects, and off-axis blur by varying surface curvature.

Working distances, gaze direction, visual field, safety hazards, lighting, task duration, and the wearer's prescription.

Back vertex power, cylinder axis, prism, optical or reference points, and add power when used correctly.

Focusing the eyepiece for the operator removes instrument-induced viewing error before target lines are interpreted.

Surface curvature or nominal surface power based on the instrument's calibration; it does not directly give total lens prescription.

Vertex distance between the back surface of the spectacle lens and the corneal apex.

Monocular or binocular pupillary distances, commonly using corneal reflections under specified viewing conditions.

Measurements such as segment height, fitting height, frame dimensions, pupillary distance checks, and lens layout verification.

A zero or alignment error can create consistent measurement mistakes even when the operator follows the correct technique.

They locate each eye independently and account for facial asymmetry, supporting accurate corridor or segment placement.

The frame's vertical tilt when the lower eyewire sits closer to the cheeks than the upper eyewire in wearing position.

The horizontal curvature of the frame front as it follows the wearer's face.

Artificial head or eye position can shift pupil, fitting-cross, or segment placement and reduce usable vision.

Inspect the frame and lenses, identify the complaint, observe wearing position, and determine the needed change before applying force.

Unequal ear height, temple angle, pad position, frame twist, or an adjustment that does not match facial asymmetry.

Confirm prescription, axis, prism, add, lens placement, cosmetic quality, frame condition, and applicable tolerances before delivery.

Clarify when and where blur occurs, verify the eyewear and prescription, and check fit before assuming nonadaptation.

Point the nose toward the target, use the appropriate vertical zone, and move the head for side targets outside the clear corridor.

The record supports continuity of care, troubleshooting, order verification, and compliance with applicable requirements.

They provide accepted limits for verifying whether finished eyewear conforms to the ordered prescription and measurements.

It establishes minimum impact-resistance expectations for spectacle lenses; special-purpose safety eyewear may require stricter standards.

Safety eyewear must meet the applicable protector standard as a complete device, including lenses, frame, markings, and coverage.

Use and disclose it only as authorized or required, protect it from inappropriate access, and follow applicable privacy rules.

The applicable state licensing law governs practice in that state; certification does not override legal scope or licensing requirements.