E09-5501 Ophthalmic Optical Kit Power +/-0.25, -0.50 Cross Cylinder Lens Set Kit 2 pcs

• Total : each kit includes 2 pieces ( Diopter 0.25 and Diopter 0.50)
• Available powers : 0.25, 0.50, 0.75, 1.00
• Handle Material : Copper
• Handle Length : 70mm
• Instruction: 
  Rectify the vertex and axial degree of the cylindrical lenses. 
  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. Comparing the changes of vision during the reversal process, if the vision is unchanged, the cylindrical lenses worn during sleep have the right vision. Otherwise, the cylindrical lenses luminosity can be adjusted according to the results. 
  When correcting the axial direction, the two axes of the cross cylindrical lenses can be placed at 45 degrees of the cylindrical lenses, and then reversed to compare the difference in vision between the two positions. 
  If the position of vision is better than the other position, the axial position of the cylindrical lens can be shifted slightly according to the direction of the same symbols in the better position, and then measured with the same method until there is no difference in vision between the two positions, indicating that the cylindrical lens is in the right position.

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