A variant or alternative spelling of dioptometer, an optical instrument used to measure lens power and refractive errors.
An alternative form of dioptometer using variant Greek combining forms, where '-miter' is a less common spelling of '-meter' for measuring instruments.
This is one of those words that appears in older optical texts and shows how scientific terminology wasn't always standardized—you'd find 'dioptometer' and 'dioptomiter' used interchangeably by different manufacturers.
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