What happens to the light motion in meridians when the examiner approaches the patient's eye during retinoscopy?

During retinoscopy, as the examiner approaches the patient’s eye, there is a specific change in the perceived motion of the light reflection, which is typically observed as the "with motion." This occurs because when the light beam from the retinoscope strikes the retina, it creates a reflex image that moves in the same direction as the light source when the examiner moves closer to the eye.

As the examiner approaches, they are effectively reducing the distance between the retinoscope and the retina, leading to a shift in the way the light interacts with the eye's optical system. This reduction in distance allows for a clearer view of the light reflex and the interpretation of the motion reflects the refractive state of the eye. The "with motion" is indicative of a hyperopic (farsighted) condition, or, in a normal state, as the examiner moves closer, the light motion in the retina continues in the same direction as the light source.

Understanding this motion during a retinoscopy is crucial for diagnosing refractive errors correctly, indicating to the examiner not only how to adjust instruments but also how to interpret findings accurately.