Trial Lens Set is kept by the ophthalmologist to test the conditions of the patient before suggesting the optimum lens required by the patient. The set includes a wide range of biconcave minus lenses of true curve and the convex plus lenses that is used during diagnosis of the problem. It helps the practitioners to suggest the ideal solution to the patient. These lenses have ideal refractive power and thus used for the trial method. Herein, only the rings and cases are updated otherwise lenses remain the same. Trial frames are used in conjunction with trial lenses.