Illuminated frenzel glasses are used in detecting?: (A) Nystagmus, (B) Heterophoria, (C) Esotropia, (D) Astigmatism
Answer is A. Ans. is 'a' i.e., Nystagmus Illuminated frenzel galsses (+20 lenses) are useful for abolishing fixation and thus revealing peripheral vestibular nystagmus.