American Board of Opticianry (ABO) Practice Test

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Prepare for the ABO (American Board of Opticianry) Test with interactive flashcards and hundreds of multiple choice questions. Updated for 2025 to help you excel on exam day

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Which of the following is considered an indicator of lens thickness in opticianry?

Saggital value
Base curves
Prism tint
Effective diameter

The correct answer is: Saggital value

The sagittal value is considered an indicator of lens thickness in opticianry because it measures the distance between the thickest and thinnest points of the lens. This measurement is important in determining the overall thickness of the lens and ensuring proper fit for the wearer. Base curves do not directly indicate lens thickness, but rather the curvature of the lens. Prism tint is a type of lens coating and does not accurately measure thickness. Effective diameter is simply the size of the lens and does not reflect its thickness.