This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
Methods to measure error of refraction are all except? 
Select and explain. 
A. Retinoscopy, B. Refractometry, C. Keratometry, D. Binocular balancing
D: Binocular balancing
Answer: D: Binocular balancing 
Explanation: Ans. is 'd' i.e., Binocular balancing Refraction The procedure of determining and correcting refractive errors is termed as refraction. The refraction comprises two complementary methods : ? Objective methods These are used to measure the error of refraction. These tests are :- Retinoscopy Keratometry Refractometry Subjective refraction Subjective refraction is meant for finding out the most suitable lenses to be prescribed. The proper subjective refraction includes three steps. Subjective verification of refraction Subjective refining of refraction Subjective binocular balancing