American Board of Ophthalmology (ABO) Practice Exam

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Which organization defines lens power tolerance standards?

ASTM
ANSI
ISO
FDA

The correct answer is: ANSI

The American National Standards Institute (ANSI) plays a crucial role in establishing lens power tolerance standards, particularly in the context of optical devices like eyeglasses and contact lenses. ANSI works to ensure that safety, quality, and performance standards are met across various industries, including ophthalmics. The specific ANSI standards help define how lens prescriptions should be manufactured and what tolerances are acceptable regarding optical power, thereby ensuring that patients receive lenses that meet their prescribed specifications. While other organizations, such as the FDA, may regulate medical devices, including some optical products, and organizations like ASTM and ISO establish standards for materials and processes, ANSI is specifically recognized for its emphasis on the performance and safety standards relevant to optical lenses and their tolerances.