Which of the following does NOT test the amount of accommodation present (amplitude)?

Which of the following does NOT test the amount of accommodation present (amplitude)?

• A. Push-up
• B. Pull-away
• C. FCC/BCC
• D. Minus lens test

Answer: (C)

The main idea is measuring how much the eyes can change focus. Push-up, pull-away, and the minus-lens test all directly load the accommodative system: with push-up you bring a near target closer so the eye must increase its focusing power, with pull-away you move the target away and release demand, and with the minus-lens test you neutralize accommodation to determine how much focus the eye can still bring to bear. The option that does not measure accommodation amplitude is the one used to assess binocular vision and eye coordination, specifically how well the eyes fuse images and maintain single vision under changing demands. It targets vergence and fusion skills rather than the amount of accommodation the eye can generate, so it does not indicate amplitude of accommodation.

The main idea is measuring how much the eyes can change focus. Push-up, pull-away, and the minus-lens test all directly load the accommodative system: with push-up you bring a near target closer so the eye must increase its focusing power, with pull-away you move the target away and release demand, and with the minus-lens test you neutralize accommodation to determine how much focus the eye can still bring to bear. The option that does not measure accommodation amplitude is the one used to assess binocular vision and eye coordination, specifically how well the eyes fuse images and maintain single vision under changing demands. It targets vergence and fusion skills rather than the amount of accommodation the eye can generate, so it does not indicate amplitude of accommodation.