If ED increases, what happens to MBS, assuming decentration remains constant?

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Prepare for the Ophthalmic Optics Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

If ED increases, what happens to MBS, assuming decentration remains constant?

Explanation:
Increasing the distance between the eye and the lens (ED) changes how the lens powers are applied at the eye and alters the retinal image when there is any defocus. With decentration held constant, moving the lens farther away makes the retinal blur larger because the light rays enter the eye over a wider angle and the image formed on the retina is more magnified for any misfocus. That bigger blur at the retina shows up as a higher MBS.

Increasing the distance between the eye and the lens (ED) changes how the lens powers are applied at the eye and alters the retinal image when there is any defocus. With decentration held constant, moving the lens farther away makes the retinal blur larger because the light rays enter the eye over a wider angle and the image formed on the retina is more magnified for any misfocus. That bigger blur at the retina shows up as a higher MBS.

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