title: Possible errors in the use of the crossed cylinder.
authors.forename: I S
authors.initials: IS
authors.lastname: PUNTENNEY
mesh_terms: D000065:Accommodation, Ocular; D005123:Eye; D006801:Humans; D013508:Ophthalmologic Surgical Procedures; D009885:Ophthalmology / Q000193:education*
keywords: EYES/accommodation and refraction; OPHTHALMOLOGY/teaching