How to read a manual lensometer

1. Turn the power wheel into the plus, then slowly decrease the power until the lensometer target (sphere and cylinder lines) is sharply focused. (Do not oscillate the wheel back and forth to find the best focus.) The power wheel should read zero if the instrument is in proper calibration. 2. focus/read the power of the single line in the reading/bottom part of the lens. Example: Distance Rx: + + x Reading power reading: + [+ – (+) = +] Rx: + + x /+ add 2Figure 9 3. When measuring a multifocal reading correction greater than +D, theFile Size: KB.  · Manual Lensometry. Adjust the eye piece until the target is clear. Position the glasses with the bottom of the frame against the frame stage. Center the target (where the lines intersect) Focus the narrow lines (single lines) and read the power wheel. This gives the spherical power. Focus the wide Estimated Reading Time: 3 mins.

9. Read the axis from the axis wheel. VI. Improving the Accuracy of Lensometer Measurements A. Keep the green filter in place at all times, except when measuring sunglasses. This filter helps to minimize color aberrations that can affect the focus. B. Lenses with small amounts ( D) of cylinder are the most difficult to measure. It is difficult. This photo shows a lensometer, a device used to check the prescription of glasses. This photo shows the focus dial on a lensometer. To determine the sphere, you need to move both the focus and axis dials so that the three small lines are straight and clear. This photo shows the lines you see when looking through a lensometer. · Read the prescription directly from the display. · The colors of the lines and scales within the viewing area of the lensometer vary by manufacturer. The placement of the wheels may also vary by model. Consult your product's owner's manual for details regarding your specific lensometer.

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