| 摘要 |
PROBLEM TO BE SOLVED: To obtain safe far and near contact lenses where sight with more than 1.0 in both far sight and near sight is superiorly corrected with a high lacrimal exchange rate and an excellent fitting feeling by permitting the size of a lens to be within a specified range and permitting the area of a near sight part to be within a specified rate range. SOLUTION: The lens size is within the range of 13.6-14.5mm and the area of the near sight part is within the range of the 35-60% of a pupil area in the contact lenses where the near sight part is at an optical part center position and a far sight part is at an optical part peripheral position. Besides, the blend width of the contact lens is within the range of 0.3-0.5mm and bell width is within the range of 0.3-0.7mm. The pulling elastic rate of a contact lens material is within the range of 0.5-1.3×10<7> dyn/cm<2> . The lenses are the moisture ones and the contact lens material is a moisture system polymer where a moisture rate is within the range of 30-75%.
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