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Here is a quick mnemonic “CORRECTION to remember about Clinical Assessment Of Visual Function : Visual Acuity

This can be valuable for patients as well as medical doctors, nurses & students doing their clinical rounds. You can also find it very useful for med exams like USMLE, MBBS, NEET PG, FMGE, NExT, MCAT & NCLEX exams

Clinical Assessment Of Visual Function: Refractive State : How To Remember Easily ?

  • C – Chart used: The Snellen chart is used to test acuity at a distance of 6 m (20 ft).
  • O – Other option: For convenience, a scale version of the Snellen chart called the Rosenbaum card is held at 36 cm (14 in.) from the patient.
  • R – Refractive correction: All subjects should be able to read the 6/6 m (20/20 ft) line with each eye using their refractive correction if any.
  • R – Reading glasses: Patients with presbyopia must wear reading glasses for accurate testing with the Rosenbaum card.
  • E – Explanation of deficiency: If 6/6 (20/20) acuity is not present in each eye, the deficiency in vision must be explained.
  • C – Counting fingers, hand motions, light perception, or no light perception: If acuity is worse than 6/240 (20/800), it should be recorded in terms of these.
  • T – Tax definition of legal blindness: Legal blindness is defined by the Internal Revenue Service as a best corrected acuity of 6/60 (20/200) or less in the better eye or a binocular visual field subtending 20° or less.
  • I – Ineligible for legal blindness: Loss of vision in one eye only does not constitute legal blindness.
  • O – One eye for driving: For driving, most states require a corrected acuity of 6/12 (20/40) in at least one eye for unrestricted privileges.
  • N – No driving with homonymous hemianopia: Patients who develop a homonymous hemianopia should not drive.


Dr. Arin Nandi

Passionate About Medical Science & Helping Future Doctors Achieve Top Ranks In Medical Exams. He is professionally a dentist as well as a public health expert from JIPMER (1), (2)working in health department