When performing a refraction test, what is indicated by the patient experiencing blur when the test object is too close?

When a patient experiences blur during a refraction test because the test object is too close, it indicates that the near point of convergence has been exceeded. This means that the eyes are unable to maintain a stable focus on an object that is too close, resulting in a blurred image. The near point of convergence refers to the closest point at which the eyes can focus on an object while also maintaining binocular vision without significant strain or discomfort.

This phenomenon typically occurs due to limitations in the eye's ability to accommodate, which is the process that allows the eye to focus on close objects. If the test object is brought closer than the patient's near point of convergence, the eye cannot converge (focus) properly on it, leading to the sensation of blur. Recognition of this condition can help in diagnosing issues related to accommodation or convergence, which are important factors in assessing overall visual function and health.

Understanding the patient's ability to accommodate and where their limits lie is crucial for determining appropriate visual aids or interventions if needed.