A child with strabismus is asked to fixate on a penlight held by the examiner. The examiner notes that the corneal reflex in the right eye is central, whereas that in the left eye is displaced approximately 3 mm temporal to the centre of the pupil.
Using Hirschberg's method for estimating the angle of strabismus, the examiner concludes that the patient has a:
A. 45-degree esotropia
B. 30-degree exotropia
C. 45-prism-diopter esotropia
D. 30-prism-diopter esotropia
E. 45-prism-diopter exotropia