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His enthusiasm for optics was shared by his son, Charles Henry Keeler, who joined him at the practice in 1924. Two years later, at the age of just 23, Charles Henry patented his first instrument - the combined luminous ophthalmoscope and retinoscope. This was the first Keeler ophthalmoscope, and over the following decades it was improved upon many times. Indeed, ophthalmoscopes became the instruments that Keeler built its reputation on.
Although the company had been manufacturing ophthalmic instruments since the 1920s, the focus on this began in earnest in 1946 when Charles Henry established Keeler Optical Products. In 1953, Keeler began its global expansion with the incorporation of Keeler Optical Products in the US.
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