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The Near Point of Convergence (NPC) is the closest point to the nose that the eyes can keep an object in single focus. The eyes naturally turn inward converge to view close objects. NPC testing determines if the eye muscles are working together effectively to sustain this alignment for near tasks.
read more about near point of convergence ...The Near Point of Convergence (NPC) is the closest point to the nose that the eyes can keep an object in single focus. The eyes naturally turn inward (converge) to view close objects. NPC testing determines if the eye muscles are working together effectively to sustain this alignment for near tasks.
To view something up close, the brain directs the eye muscles to pull the eyes inward. The Near Point of Convergence is reached when one eye can no longer maintain focus, and the person experiences diplopia (double vision) or the doctor observes one eye drifting outward. This failure point signals the limit of the eyes' ability to converge.
A receding or far Near Point of Convergence indicates a reduced ability to converge, which causes strain during reading.
The eye doctor uses a small target, like a penlight or a dot card, and slowly moves it toward the bridge of the patient's nose. The doctor notes the point where the patient reports double vision break point and the point where the eyes resume single vision (recovery point).
No, a near point of convergence should be very close to the nose, ideally within a few centimeters.
Yes, vision therapy involving exercises like push-ups can improve the NPC distance.
Yes, when reading, the eyes may drift, causing intermittent double vision.
If you notice your eyes "give up" and things go double when you bring a book close to your face, you may have Convergence Insufficiency (CI). This is easily treated with "pencil push-up" exercises or specialized vision therapy.
COVD. Convergence Insufficiency (covd.org). 2024.
Mayo Clinic. Convergence insufficiency symptoms & causes (mayoclinic.org). 2024.
Review of Optometry. Managing Binocular Vision (reviewofoptometry.com). 2023.
AOA. Convergence Insufficiency (aoa.org). 2024.