Neutral density filter -
Ans. (c) Afferent pupillary defectRef: Essentials of ophthalmology p. 53"Neutral density filters can be used to grade the severity of afferent pupillary defect"--Essentials of ophthalmology
Amblyopia
Malingering
Afferent pupillary defect
Efferent pupillary defect
Neuro-Ophthalmology