The near point of convergence is reached when the test object:

The near point of convergence is defined as the closest distance at which an object can be clearly seen by the eyes while maintaining proper convergence, which is the inward turning of the eyes to focus on a close object. When the test object becomes blurry, it indicates that the eyes can no longer maintain convergence effectively at that distance, signaling that the near point of convergence has been reached.

When an object is positioned too close for the visual system to focus properly, the brain receives conflicting visual information, leading to a blurred image. This response is a natural indicator of how well the visual system can accommodate and converge. It reflects the limits of ocular convergence and accommodation, which is crucial for assessing vision and understanding how people with different conditions might experience changes in their visual acuity and comfort when viewing close objects.