FREE CPO Ophthalmic Optics and Dispensing Questions and Answers
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 does a prescription with "+2.00" in the sphere indicate?
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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.
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.