1. the simultaneous movement of both eyes in opposite directions to maintain single binocular vision
Usage: ophthalmology; vision science
2. the degree of convergence or divergence of light rays
Usage: optics; physics

Examples

• The eye doctor tested the patient’s vergence to check for vision problems.
• Convergence vergence occurs when both eyes turn inward to focus on a near object.
• Divergence vergence happens when the eyes move outward to view distant objects.
• The lens system’s vergence determines how light rays will bend.
• Measuring vergence helps optometrists prescribe corrective lenses.
• Poor vergence control can lead to double vision or eye strain.