Fig. 12c Continued. M. Which mirror has the proper orientation? Objects seen in the mirror are simply 180 degrees away, not crossed over. Angle orientation is simple and straight across. Mirror A is the correct answer. Mirror B is crossed over and is incorrect. N. Both mirrors now show the proper orientation. O. Diagram your findings. This goniophotograph is a view of the superior mirror revealing the inferior angle from an area that is recessed at the 4 o'clock posisiton to a broad area of PAS at approximately the 7:30 position. One method is to make a circle and use your favorite alphanumeric system to describe the angle at the appropriate clock hours. P. Refinishing a Zeiss mirrored lens is difficult. The silver mirror coating eventually has to be replaced. A higher grade of glass with greater reflectivity is an engineering marvel and acts as a mirror and reflects the light to the examiner. Therefore a mirror coating is not necessary. These lenses are new and are just starting to be evaluated in the field at the time of this writing (Gaasterland lens, Ocular Instruments, Bellevue, WA).