The Optics, Refraction, and Instruments Examination is frequently taken early in residency training. The examination is presented in a booklet and consists of 60 single best answer questions. The Optics, Refraction, and Instruments Examination takes one-and-a-half hours. Each question consists of four single best answer options, with one correct answer. This examination is part of the pathway towards Fellow of the International Council of Ophthalmology designation FICO and Fellow of the Royal College of Physicians and Surgeons of Glasgow designation FRCS (Ophth) (Glasg).

The candidates enter their answers on response sheets which are then computer marked. A positive mark is awarded for each correct answer. No mark is given to those questions marked incorrectly or left blank. Answering all the questions accurately is the best way of obtaining a pass grade but because accuracy of answers is very important and takes time is still possible to pass the examination without completing all questions.