In Correct Eye Scope near setting, what is the ortho separation?

In Correct Eye Scope near setting, what is the ortho separation?

• A. 87 mm
• B. 68 mm
• C. 63 mm
• D. 58 mm

Answer: (D)

The idea to understand here is ortho separation: it’s the distance between the two optical channels (the centers of projection for each eye) that the device uses when the eyes are in a neutral, aligned position at near. In the Correct Eye Scope’s near setting, this separation is a fixed value chosen to align the stimuli with the patient’s visual axes for near viewing, giving a reliable baseline for measuring vergences. For this device and setting, the standard near ortho separation is 58 mm. That value ensures the near targets fall along the appropriate lines of sight without introducing extra prism-induced demand, so the measurements reflect true vergence responses rather than misalignment. The other numbers would correspond to different IPD values or far-task settings, not the near-task ortho separation used here, so they aren’t the correct choice in this context.

The idea to understand here is ortho separation: it’s the distance between the two optical channels (the centers of projection for each eye) that the device uses when the eyes are in a neutral, aligned position at near. In the Correct Eye Scope’s near setting, this separation is a fixed value chosen to align the stimuli with the patient’s visual axes for near viewing, giving a reliable baseline for measuring vergences.

For this device and setting, the standard near ortho separation is 58 mm. That value ensures the near targets fall along the appropriate lines of sight without introducing extra prism-induced demand, so the measurements reflect true vergence responses rather than misalignment.

The other numbers would correspond to different IPD values or far-task settings, not the near-task ortho separation used here, so they aren’t the correct choice in this context.