Certified Paraoptometric (CPO) Practice Exam 2025

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Which type of lens combines a spherical lens with a plano cylindrical lens?

Aspheric lenses
Spherocylindrical lenses
Planocylindrical lenses
Bifocal lenses

The correct answer is: Spherocylindrical lenses

The combination of a spherical lens with a plano cylindrical lens is found in spherocylindrical lenses. These lenses are specifically designed to correct both spherical and astigmatic refractive errors. The spherical component addresses typical nearsightedness or farsightedness, while the plano cylindrical part is oriented to correct the varying focus caused by astigmatism. This design allows for a single lens to provide multiple focal points, ensuring sharper vision at different angles and distances. This is particularly beneficial for individuals who need corrective lenses for more than one refractive error, making spherocylindrical lenses a common choice in optometry for those diagnosed with astigmatism in addition to other visual impairments.