what does a stenopaic slit do?
The subjective refraction performed with the stenopaic slit is a procedure especially useful in cases of high astigmatism and poor visual acuity. The stenopaic slit placed in front of the eye isolates an ocular meridian on which to perform the refraction, independently of the other meridians.econd, it is shown that this representation can be used in the analysis of the optical principles of different subjective refraction procedures such as the stenopaic slit refraction, the Barnes astigmatic decomposition method, and the Jackson cross-cylinder (JCC) procedure.