FREE CPO Ophthalmic Optics and Dispensing Questions and Answers
What does a prescription with "+2.00" in the sphere indicate?
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Wrong!
A "+2.00" in the sphere indicates farsightedness (hyperopia), requiring a convex lens to converge light onto the retina.
Which lens material is most impact-resistant and often recommended for children?
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Polycarbonate lenses are lightweight, highly impact-resistant, and provide UV protection, making them a safe and practical choice for children and active individuals
What is the primary purpose of the pupillary distance (PD) measurement?
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Pupillary distance is measured to ensure that the optical centers of the lenses align with the patient's pupils, providing accurate vision correction.
Which type of lens is used to correct myopia?
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Myopia (nearsightedness) is corrected with concave lenses, which diverge light rays to focus them on the retina.
What is a progressive addition lens (PAL)?
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PALs provide a smooth transition between distance, intermediate, and near prescriptions without visible lines, ideal for presbyopia correction.