ABO NOCE Practice Test

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When the cylinder power is greater than 1.50, what is the tolerance for axis power?

The correct answer is: 2°

When the cylinder power is greater than 1.50, the accepted tolerance for the axis power is specified as 2°. This standard is rooted in the need for precision in optical prescriptions, particularly for individuals who may have significant astigmatism. In the context of optics, the axis refers to the orientation of the cylindrical correction used to address astigmatism. Having a tighter tolerance of 2° ensures that the optical performance remains optimal, preventing visual disturbances that might arise from misalignment of the cylindrical axis, especially in higher prescriptions. This standard is critical for practitioners to follow, as deviations from the specified axis tolerance can lead to less effective vision correction and discomfort for the patient. Understanding these specifications helps ensure that eye care professionals can provide the best outcomes for their patients with cylindrical corrections.