NEW EYE TESTER (Feb, 1929)
NEW EYE TESTER
THIS remarkable instrument, which is in reality a battery of lenses no bigger than a cigar box, enables the optician to secure over one million combinations of lenses almost instantaneously. The London Refraction Hospital which has recently been rebuilt at a cost of $50,000, contains this machine among many others of the same type. Testing of the human eye is one of the most difficult tasks that the eye specialist encounters. Every person has different eye strengths so this machine was developed to reveal the fact that a patient’s eye deviates by as little as a quarter of a degree from its normal outlook. The patient is fitted to the machine and then the optician adjusts the various lenses until the proper lens fits each eye.
This device is practically “fool proof” and the optician is enabled to measure the eye with extreme accuracy.