COMPENSATED POWERSINGLE VISION & PROGRESSIVE LENSES

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IMPORT ATIENTS T

Vis important to compensate and correct the effect caused by oblique astigmatism

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especially in medium high powers or wrap frames,

CONVENTIONAL COMPENSATED

VA 0.5 VA 0.8A 0.8 V A1.0 VA 1.0 VA 1.0A 1.0 V A1.0

• Clear vision only at the center.• Reduced visual field.• Visual acuity decrease when looking peripherally

• Clear vision from center to edge.• Maximized visual field.• Maximum VA throughout the entire lens

COMPENSATED POWERPROGRESSIVE AND SINGLE VISION

POWER CALCULATION FOR CONVENTIONAL LENSES

POWER CALCULATION FOR COMPENSATED LENSES

Visual Field Optimization™ t

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CONVENTIONAL COMPENSATED

90º

Intermediate Ray-trace90º

90º

• Lens power is not compensated• The power of the lens matches the patient’s Rx• Oblique aberrations reduce visual acuity

• It considers the real eye-lens system• The power of the lens = compensated power• Their user will perceive their accurate Rx power

Far Ray-trace

Near Ray-trace

HOW TO CHECK A COMPENSATED LENS WITH THE LENSOMETER

PRESCRIBED POWER

Prescribed Power is determined by a doctor’s prescription. Conventional lenses are calculated to yield this power when measured with a lensometer (perpendicular to the back surface). However, when using a lensometer with compensated lenses, measured power is different from prescribed power.

COMPENSATED POWER

Visual Field Optimization™ eliminates oblique aberrations, modifying power at each point on the lens. Users therefore get the power they need in addition to better vision in each gaze direction. Nonetheless, the lens will read a different power when measured using a lensometer, a difference called Compensated Power.

PRESCRIBEDCOMPENSATED POWER

POWER

Visual Field Optimization™ lenses display both Prescribed Power and Compensated Power. Compensated Power is the power that must be checked for quality inspection using the lenso meter.

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