In 1903, Claude Worth introduced his fusion theory of strabismus.
Worth linked fusion to binocular vision and divided binocular vision
into three grades. He additionally created a test to measure
the degree of fusion. Some of Worth’s research turned out to be
invalid, but he did lead other scientists to relating fusion and
binocular vision. The scientists that followed Claude Worth
made many innovative discoveries based on Worth’s original thought
process.
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