ICO Visual Sciences study guide
ICO Visual Sciences · Work through your exam, one topic at a time.
The ICO Visual Sciences Examination is a standardized, multiple-choice test of the basic and clinical science underpinning ophthalmology, administered within the International Council of Ophthalmology's assessment programme. It is aimed at trainees who have completed foundational ophthalmology training and want an external, internationally benchmarked check of their grasp of visual science before or alongside clinical specialty examinations. The ICO Visual Sciences study guide has 10 sections and about 2,818 words.
01Optics and Refraction
The Optics and Refraction domain tests geometrical optics, lens power, vergence, refractive error correction, and the clinical arithmetic behind spectacle and contact lens prescribing. Expect calculations rather than vocabulary alone.
333 words, about 2 min02Physiological Optics and Visual Perception
This domain tests how the eye forms an image and how the visual system converts it into detectable contrast, acuity, depth, and colour. Calculations often involve diffraction, visual angle, and psychophysical thresholds.
291 words, about 1 min03Anatomy and Histology of the Eye and Visual Pathway
This domain tests structure-function relationships from cornea to cortex, including laminar organization, blood supply, and lesion localization. Histology questions often hinge on cell layers and orientation.
281 words, about 1 min04Ocular Physiology and Biochemistry
This domain tests aqueous dynamics, corneal transparency, tear film, lens metabolism, and retinal homeostasis. Exam items often combine a formula with a clinical scenario such as glaucoma or dry eye.
271 words, about 1 min05Retina and Visual Neuroscience
This domain tests retinal circuitry, phototransduction, receptive fields, and cortical processing. Questions often ask you to predict a response from a stimulus or to separate rod from cone function.
283 words, about 1 min06Ocular Motility and Binocular Vision
This domain tests extraocular muscle actions, innervation, laws of motor control, strabismus, and sensory adaptation. Expect questions that combine a motility finding with a calculation or a binocular test.
276 words, about 1 min07Ocular Pharmacology and Toxicology
This domain tests drug delivery, autonomic control, anti-inflammatory and anti-infective therapy, and adverse effects. Questions often ask why a topical drug causes a systemic effect or which drug is contraindicated.
248 words, about 1 min08Ocular Microbiology and Immunology
This domain tests normal ocular flora, common pathogens, host defence, and immune-mediated disease. Exam items often use a clinical pattern to point to an organism or an immune mechanism.
277 words, about 1 min09Ocular Pathology and Genetics
This domain tests neoplastic, degenerative, and inherited ocular disease, with emphasis on mechanisms and inheritance patterns. Genetics questions often ask you to infer risk from a pedigree or a molecular finding.
266 words, about 1 min10Clinical Visual Sciences and Diagnostic Testing
This domain tests the principles, limitations, and interpretation of psychophysical and imaging tests. Questions often ask which test answers a specific clinical question or why a result is unreliable.
292 words, about 1 min