What you MUST bring on your First Day: 1  Any two of the acceptable forms of identification listed in the Form I-9 list of acceptable documents. 2  A check to verify that information on the direct deposit form is correct. There is no need to void a check.
Manifest refraction - A manifest refraction is the most traditional way of measuring one's refractive error. As mentioned above, it is usually the part where the patient is shown choices and is involved in the process.
Figure 1. Pencil in glass of water. Refraction is the bending of light rays when they cross an interface between two materials with different refractive indices. For example, when light passes from air into the water at an angle, the light ray will bend toward the normal to the surface.