Question

what is frame of reference​

Answer 1

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Nounplural frames of reference.

A framework that is used for the observation and mathematical description of physical phenomena and the formulation of physical laws usually consisting of an observer a coordinate system and a clock or clocks assigning times at positions with respect to the coordinate system.

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Answer 2

Answer:

Subjective Refraction is an attempt to determine, by trial and error using the patient’s cooperation, the combination of lenses that will provide the best corrected visual acuity (BCVA).It is a clinical examination used by orthoptists, optometrists and ophthalmologists to determine a patient's need for refractive correction, in the form of glasses or contact lenses. The aim is to improve current unaided vision or vision with current glasses. Glasses must also be comfortable visually. The sharpest final refraction is not always the final script the patient wears comfortably.