Cylindrical Lenses

العدسات الأسطوانية

A cylindrical lens has no refractive power along its axis and maximum power 90 degrees away from the axis.

Quick Decode

A cylindrical lens adds no focusing power along its axis and has its greatest power in the direction 90 degrees from that axis. This direction-dependent power helps correct astigmatism, where the eye focuses light differently in different directions.

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References (1)
  1. Carl Zeiss Vision – Introduction to Ophthalmic Optics introduction_to_ophthalmic_optics