NCLE Basic Lensometry Exam Latest Updates

NCLE Basic Lensometry What instrument is used to read the prescription from a pair of spectacle lenses? Lens Clock Lensometer Keratometer - Lensometer The process of reading a prescription off a pair of glasses when the prescription is unknown is called what? Transposition Negation Neutralization - Neutralization The power drum on a lensometer is marked with what range of numbers? -20.00 to +20.00 -10.00 to +10.00 0 to 180 degrees - -20.00 to +20.00 To ensure pwoer readings for a pair of glasses are taken on the same horizontal plane, you would secure the lenses on or with what? With the power drum With the spotting device With the lens holder on the lens table - With the lens holder on the lens table When a lens haas more than __________ amount of prism, you may need to use the auxillary prism compennsator to find the optical center of the lens. 4 degrees 4 diopters 4 meters - 4 diopters The first step in neutralizing lenses is to turn the lensometer on and set what dial or ring to zero? Prism compensator and power drum Adjustable eyepiece and axis wheel Lens holder and lens table - Prism compensator and power drum The spotting device leaves 3 dots on a lens. What does the center dot indicate? Point of refraction Cylinder axis point The optical center - The optical center When you look inside a lensometer you will see a series of rings, which is called a __________. Reticle Target Sphere - Reticle Neutralizing lenses is a fairly simple process, and most new associates can expect to become proficient at it with very little time or practice. True False - False Spherical lenses can be turned in any direction, as their power will be the same in every meridian. True False - True Compound lenses are lenses that have both __________ and __________ power. Sphere, Cylinder Near, Distance Vertical, Horizontal - Sphere, Cylinder When reading a single vision lens, you will follow different steps than if you were neutralizing a spherical lens. True False - False Which of the following statements is correct regarding reading compound lenses with a lensometer? Thin lines indicate cylinder power and thick lines indicate spherical power. Thin lines indicate spherical power and thick lines indicate cylinder power. A solid line indicates cylinder power and a dotted line indicates sphere power. - Thin lines indicate spherical power and thick lines indicate cylinder power. It is important to note whether the cylinder power is a plus number or a minus number. True False - True