Anomaloscope is a term commonly used in ophthalmology, which refers to an instrument used for testing color vision deficiencies. Some synonyms for anomaloscope often used in the medical field include a colorimeter, a photoelectric anomaloscope, and a psychophysical comparator. Other words that can be used interchangeably with anomaloscope may include spectrophotometer or a colorimeter. These devices all serve the same purpose as an anomaloscope in determining an individual's color vision. Whether studying color perception for medical reasons or simply interested in the variations of human sight, there are a variety of terms and devices that can be used to describe the process.