Gwen’s doctor discovers that Gwen has reduced visual acuity. Gwen’s doctor performs a procedure called ? , which detects the eye’s refractive error using an instrument called the
phoropter
.

 Refraction  Phoropter

Explanation:

Refraction (refractive power): As light enters the eye, the lens helps focus light rays so that they come to a focus on the retina. This action is called refraction.

An instrument called a phoropter detects the eye’s error of refraction.

answer; im thinking (france);