Certified Paraoptometric Assistant Review Course -
Questions With Expert Solutions
Minus Cylinder Form Correct Answer - Lens powers are written in this
form
Two Digits After Decimal Point Correct Answer - All powers should be
written with this precision
Prism Specification Correct Answer - Must include amount and base
direction
Interpupillary Distances Correct Answer - Both distance and near PD must
be included for multifocals
Seg Inset Calculation Correct Answer - Distance PD minus Near PD
Segment Height Specification Correct Answer - Specify for multifocals
when ordering
Lensometer Correct Answer - Instrument to measure power of spectacle
lenses
Lensometer Calibration Correct Answer - Check focus and calibration
Manual Lensometry Principles Correct Answer - Process to determine lens
type and power
Spherical Lens Identification Correct Answer - Both lines focused indicate
a spherical lens
Spherocylinder Lenses Correct Answer - Focus first set of lines for each
power component
Broken Lines Correction Correct Answer - Adjust axis wheel until sphere
lines are unbroken
, Bifocal Add Power Calculation Correct Answer - Difference between
distance and bifocal segment powers
Measuring Prism Correct Answer - Prism specified in diopters and
direction relative to the eye (base in, base out, base up, base down) deflects
lensometer target away from the reticle center.
Ring Progression Correct Answer - Measurement in 0.5-1 prism diopters.
Frame Eyesize (A Dimension) Correct Answer - Largest horizontal
distance across the lens.
Frame Eyesize (B Dimension) Correct Answer - Largest vertical dimension.
Bridge Size Correct Answer - Distance between lenses, indicating the
separation of two lenses.
Lens Centration Correct Answer - Ensures lens is correctly positioned,
considering ophthalmic lens power, prism, material, design, base curve,
warpage, center thickness, and quality.
Lens Clock Correct Answer - Used to measure base curve, rotating for toric
lenses, with black/plus scale for convex front and red/minus for concave back
surface.
Center Thickness Correct Answer - Measured using thickness caliper and
dial-thickness gauge, with industrial eyewear requiring at least 3mm
thickness and polycarbonate 2.2mm.
Tints and Coatings Correct Answer - Includes verification of ultraviolet
protection, segment type, height, width, alignment of multifocals, marking
progressive lenses, identifying watermarks, lens bevel, and ensuring optical
quality.
Frame Size Correct Answer - Involves A dimension, DBL, temple length,
reference to boxing system, color, and shape.
Questions With Expert Solutions
Minus Cylinder Form Correct Answer - Lens powers are written in this
form
Two Digits After Decimal Point Correct Answer - All powers should be
written with this precision
Prism Specification Correct Answer - Must include amount and base
direction
Interpupillary Distances Correct Answer - Both distance and near PD must
be included for multifocals
Seg Inset Calculation Correct Answer - Distance PD minus Near PD
Segment Height Specification Correct Answer - Specify for multifocals
when ordering
Lensometer Correct Answer - Instrument to measure power of spectacle
lenses
Lensometer Calibration Correct Answer - Check focus and calibration
Manual Lensometry Principles Correct Answer - Process to determine lens
type and power
Spherical Lens Identification Correct Answer - Both lines focused indicate
a spherical lens
Spherocylinder Lenses Correct Answer - Focus first set of lines for each
power component
Broken Lines Correction Correct Answer - Adjust axis wheel until sphere
lines are unbroken
, Bifocal Add Power Calculation Correct Answer - Difference between
distance and bifocal segment powers
Measuring Prism Correct Answer - Prism specified in diopters and
direction relative to the eye (base in, base out, base up, base down) deflects
lensometer target away from the reticle center.
Ring Progression Correct Answer - Measurement in 0.5-1 prism diopters.
Frame Eyesize (A Dimension) Correct Answer - Largest horizontal
distance across the lens.
Frame Eyesize (B Dimension) Correct Answer - Largest vertical dimension.
Bridge Size Correct Answer - Distance between lenses, indicating the
separation of two lenses.
Lens Centration Correct Answer - Ensures lens is correctly positioned,
considering ophthalmic lens power, prism, material, design, base curve,
warpage, center thickness, and quality.
Lens Clock Correct Answer - Used to measure base curve, rotating for toric
lenses, with black/plus scale for convex front and red/minus for concave back
surface.
Center Thickness Correct Answer - Measured using thickness caliper and
dial-thickness gauge, with industrial eyewear requiring at least 3mm
thickness and polycarbonate 2.2mm.
Tints and Coatings Correct Answer - Includes verification of ultraviolet
protection, segment type, height, width, alignment of multifocals, marking
progressive lenses, identifying watermarks, lens bevel, and ensuring optical
quality.
Frame Size Correct Answer - Involves A dimension, DBL, temple length,
reference to boxing system, color, and shape.
