A suggested standard trial case and simplification in ophthalmic policy

In a previous paper to the Society, the writer gave a review of the cumulative errors arising in present-day ophthalmic practice. It was suggested that plano-form trial lenses should supersede the existing symmetrical form. The object of the present paper is to describe such a standard trial case with specified thicknesses, diameters, tolerances, etc., which will introduce minimum confusion - actually none - in practice, will materially help both refractionist and manufacturer, and will remove the uncertainty between them. Policy of simplification and economy in ophthalmic manufacture is also suggested. That such a change is demanded is shown by the papers of Mr O. P. Raphael* and the writer dagger and the discussions on the same.