The word "optometer" refers to an instrument used for measuring the refractive power of the eye. The spelling of the word can be explained using the International Phonetic Alphabet (IPA) as /ɒpˈtɒmɪtər/, where the first syllable is pronounced with the short "o" sound, the second syllable with a schwa sound, and the third syllable with the short "i" sound. The final "er" is pronounced with a neutral "uh" sound. Overall, the spelling of "optometer" accurately represents its pronunciation.
An optometer is a specialized instrument used in optometry, which is a branch of medicine that deals with the measurement of vision and the correction of visual defects. The optometer is primarily employed to determine the refractive power of an individual's eyes, allowing eye care professionals to prescribe appropriate corrective lenses such as glasses or contact lenses.
The optometer is typically composed of various lenses and mechanisms that allow for precise measurement of visual acuity. It works by simulating different combinations of lenses in front of the patient's eyes, while the person looks at a specific target. Based on the patient's responses, the optometer calculates their refractive error, which is the discrepancy between their actual visual acuity and standard or average visual acuity.
Optometry professionals typically employ the optometer during eye examinations to determine the right prescription for corrective lenses. By analyzing the patient's visual acuity and identifying any vision abnormalities, the optometer assists in enhancing the clarity and sharpness of their vision. It can measure nearsightedness (myopia), farsightedness (hyperopia), astigmatism, and other types of common vision problems.
In summary, an optometer is a vital tool used by optometrists and ophthalmologists to assess a person's visual acuity. By determining the refractive power of the eyes, it aids in prescribing appropriate corrective lenses to improve the individual's overall visual quality and comfort while performing daily tasks.
An instrument for determining the condition of refraction of the media of the eye; opsiometer, optimeter.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
An instr. for measuring the limits of distinct vision.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
The word "optometer" is a combination of two Greek roots: "opto" and "metron".
- The root "opto" (ὄπτος) comes from the Greek verb "horao" (ὁράω), which means "to see" or "to look". This root is commonly found in words related to vision or sight, such as "optic", "optical", or "optics". In the case of "optometer", it emphasizes its connection to measuring or assessing vision.
- The root "metron" (μέτρον) means "measure" in Greek. It is found in various words related to measurement, such as "meter", "thermometer", or "geometry". In "optometer", it indicates the instrument's purpose of measuring or quantifying something related to vision.