American Board of Opticianry (ABO) Practice Test

Where is the industry standard between the alignment markings on a progressive lens?

1. The side of the lens where the add power if etched

2. On the temporal side of the lens

3. Unit of measurement for ophthalmic prism

4. When a patient's eyes move inward to focus at near

The correct answer is: On the temporal side of the lens

The other options are incorrect for a few reasons A: This option mentions the "add power," which is not relevant to the industry standard for alignment markings on a progressive lens. The add power refers to the additional power needed to see clearly at near distances, whereas the alignment markings indicate how to accurately place the lens on the patient's face. C: This option refers to the unit of measurement for ophthalmic prism, which is not related to alignment markings for progressive lenses. Prism measurement is used to correct for double vision, not to indicate where the industry standard for alignment markings should be. D: This option mentions a patient's movement of their eyes inward to focus, which is not applicable to determining the industry standard for alignment markings. Additionally, focusing at near distances may not always require inward eye movements, as some individuals may have a relaxed convergence when focusing at near.