To the Editor:
This letter is in response to the editorial on Corneal Contact Lenses: Large or Small? by Perry Rosenthal, MD, which appeared in the November issue of the Archives of Ophthalmology (76:631 [Nov] 1966). I am delighted to see that Dr. Rosenthal has become an advocate of small, thin lenses and that he feels the technique of selecting the diameter by lens diameter (LD) + 2 is a step in the right direction to develop a "rational approach to the science of contact lens fitting." I agree with him that no simple formula can substitute for the intelligent use of simple observation in the fitting of corneal contact lenses.However, I do object strongly to the selection of the central posterior curve by trial fitting rather than the intelligent use of the keratometer and to the use of trial lenses to determine the diameter. The use of trial