American Board of Ophthalmology (ABO) Practice Exam

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What is the standard pantoscopic angle for most frames?

5 to 10 degrees
8 to 15 degrees
10 to 20 degrees
15 to 25 degrees

The correct answer is: 8 to 15 degrees

The standard pantoscopic angle for most frames typically ranges from 8 to 15 degrees. This angle refers to the tilt of the lenses in relation to the vertical plane when the glasses are worn. A proper pantoscopic angle enhances the wearer's comfort and visual acuity by allowing optimal alignment of the optical axis of the lenses with the wearer’s eyes. The specified range of 8 to 15 degrees is designed to balance aesthetic considerations with functional requirements. This angle can help provide a better view by reducing distortion in peripheral vision and ensuring that the lenses are appropriately positioned in front of the eyes. Additionally, a pantoscopic angle within this range accommodates various face shapes and sizes, which is crucial for a comfortable fit. When examining the other ranges, they either exceed or fall short of the typical parameters established in optical fitting standards. Framing the benefits of having the appropriate pantoscopic angle illuminates why the selected range is optimal for most eyewear designs.