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Refractometry without requiring patient response is considered to be

  1. subjective

  2. active

  3. passive

  4. objective

The correct answer is: objective

Refractometry without requiring patient response is considered to be objective because it is performed using instruments that provide data regarding the patient's refractive error without relying on their subjective feedback. This method allows for an accurate evaluation of the patient's refractive status without the need for their active participation or subjective input. This approach is particularly useful in cases where patients are unable to provide feedback or when a more precise measurement is needed. Options A, B, and C are incorrect: A. Subjective refractometry requires patient responses, such as identifying which lens provides clearer vision, making it reliant on subjective feedback. B. Active refractometry involves the patient actively participating in the process, which is not the case when refractometry is performed without patient responses. C. Passive refractometry is not a common term used in ophthalmic practice to describe refractometry without patient response; the term "objective" is more appropriate in this context.