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Description Place the cross cylindrical lens on the cylindrical lens money to make an axis coincide with the cylindrical lens axis, and then reverse the cross cylindrical lens to rotate the axis 90 degrees.
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2 lenses with opposite axial refractive power, used for astigmatism
Feature
- Color: As shown.
- Material: Copper and Glass.
- Size: About 10.8*3.8*0.4cm.
- Handle Length: About 70mm.
- and .
- Use for Optometry.
- Made of copper and glass material.
- When correcting the axial direction, the two axes of the cross cylindrical lenses can be placed at 45 degrees of the cylindrical lenses.
50 lens