100+ Free ICO Visual Sciences Practice Questions
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Key Facts: ICO Visual Sciences Exam
120 questions
ICO Visual Sciences (Part A) is a 120-question single-best-answer paper
International Council of Ophthalmology - Visual Sciences (Part A)
3 hours
Candidates have three hours to complete the 120-question examination
International Council of Ophthalmology - Visual Sciences (Part A)
4 options
Each question has four options with a single best answer
International Council of Ophthalmology - Visual Sciences (Part A)
No negative marking
Correct answers score a positive mark; wrong or blank answers score nothing
International Council of Ophthalmology - Visual Sciences (Part A)
About 6 weeks
Results are released roughly six weeks after the examination
International Council of Ophthalmology - Examination FAQ
~CHF 460
Approximate Part A fee for higher-income countries, scaled by income category
International Council of Ophthalmology - ICO Examination
Early in residency
Visual Sciences is frequently taken early in ophthalmology training
International Council of Ophthalmology - Visual Sciences (Part A)
100
Free original practice questions in this bank
OpenExamPrep
The ICO Visual Sciences Examination (Part A) is the basic-sciences paper of the International Council of Ophthalmology examination, usually taken early in ophthalmology residency. It is a 120-question single-best-answer multiple-choice paper sat over three hours, with four options per question and one best answer. There is no negative marking: correct answers score a positive mark while incorrect or blank answers score nothing. The syllabus spans optics, ocular anatomy and embryology, neuro-anatomy, physiology and vision, biochemistry, genetics, pathology, microbiology, immunology, pharmacology, and epidemiology and statistics. This 100-question bank provides original single-best-answer practice across those visual and basic sciences areas with full explanations.
Sample ICO Visual Sciences Practice Questions
Try these sample questions to test your ICO Visual Sciences exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1Light travels from air into the cornea, whose refractive index is about 1.376. Compared with its speed in air, the speed of light inside the cornea is:
2The total refractive power of the average human eye is closest to:
3The cornea provides about two-thirds of the eye's total refracting power. The single most important reason the cornea refracts so strongly is:
4A thin lens has a focal length of 0.25 metres. Its dioptric power is:
5A prism deviates a ray of light. The direction in which a prism bends the path of light is:
6One prism dioptre is defined as the power that displaces a ray of light by:
7In a simple myopic eye, parallel rays from a distant object come to a focus:
8Regular astigmatism in which the two principal meridians are perpendicular is best corrected with a:
9The far point of an emmetropic eye is located at:
10During accommodation to view a near object, the crystalline lens becomes:
About the ICO Visual Sciences Exam
The ICO Visual Sciences Examination (Part A) is the basic and visual sciences component of the International Council of Ophthalmology assessment programme. It is a 120-question single-best-answer paper sat over three hours and is frequently taken early in ophthalmology residency. The syllabus covers anatomy of the eye, orbit and related structures, embryology, neuro-anatomy, vision, ocular physiology, biochemistry and cell biology, genetics, pathology, microbiology, immunology, pharmacology, and epidemiology and statistics. Each question has four options with one best answer, a correct answer scores a positive mark, and incorrect or blank answers receive no mark, so there is no negative marking. Results are typically released about six weeks after the examination.
Assessment
A single paper of 120 single-best-answer multiple-choice questions covering optics, ocular anatomy and embryology, neuro-anatomy, ocular physiology and vision, biochemistry and cell biology, genetics, pathology, microbiology, immunology, pharmacology, and epidemiology and statistics.
Time Limit
3 hours (180 minutes) for the 120-question paper.
Passing Score
Candidates must meet the standard set by the ICO examiners. A positive mark is given for each correct answer and no mark for incorrect or unanswered questions, so there is no negative marking. Results are released approximately six weeks after the examination.
Exam Fee
Fees are scaled by World Bank country income category. The Visual Sciences (Part A) fee is in the region of CHF 460 for higher-income countries, with lower fees for lower-income countries and discounts for members of ICO member societies. (International Council of Ophthalmology (ICO))
ICO Visual Sciences Exam Content Outline
Optics and Refraction Theory
Geometrical and physical optics, vergence and the lens equations, refraction at curved surfaces, prisms and prism dioptres, the reduced and schematic eye, accommodation and the optical basis of ametropia. Focuses on the theory underlying clinical refraction rather than instrument technique.
Ocular Anatomy and Embryology
Gross and microscopic anatomy of the cornea, sclera, uvea, lens, retina, optic nerve, orbit, extraocular muscles and adnexa, the blood supply and innervation of the eye, neuro-anatomy of the visual pathway, and the embryological origins and development of ocular structures.
Ocular Physiology and Vision Science
Corneal transparency and metabolism, aqueous humour dynamics and intraocular pressure, lens physiology, retinal phototransduction, the retinal pigment epithelium, colour vision, dark adaptation, binocular vision and the physiology of the visual pathway.
Biochemistry, Cell Biology and Genetics
Tear film composition, ocular metabolism and biochemistry, collagen and matrix biology, cell signalling, and the genetics of inherited eye disease including dominant, recessive, X-linked and mitochondrial inheritance and common gene-disease associations.
Pathology, Microbiology and Immunology
General pathological processes, inflammation, wound healing and neoplasia applied to the eye, ocular microbiology of bacterial, viral, fungal and parasitic pathogens, and immunology including hypersensitivity reactions and ocular immune privilege.
Ocular Pharmacology
Routes of ocular drug delivery and ocular pharmacokinetics, autonomic pharmacology of the eye, mydriatics and cycloplegics, anti-glaucoma agents, anti-infectives, anti-inflammatories, local anaesthetics and important systemic ocular side effects.
Epidemiology and Statistics
Study designs, incidence and prevalence, relative risk and odds ratios, sensitivity, specificity and predictive values, screening principles and basic biostatistics applied to ophthalmic research and practice.
How to Pass the ICO Visual Sciences Exam
What You Need to Know
- Passing score: Candidates must meet the standard set by the ICO examiners. A positive mark is given for each correct answer and no mark for incorrect or unanswered questions, so there is no negative marking. Results are released approximately six weeks after the examination.
- Assessment: A single paper of 120 single-best-answer multiple-choice questions covering optics, ocular anatomy and embryology, neuro-anatomy, ocular physiology and vision, biochemistry and cell biology, genetics, pathology, microbiology, immunology, pharmacology, and epidemiology and statistics.
- Time limit: 3 hours (180 minutes) for the 120-question paper.
- Exam fee: Fees are scaled by World Bank country income category. The Visual Sciences (Part A) fee is in the region of CHF 460 for higher-income countries, with lower fees for lower-income countries and discounts for members of ICO member societies.
Keys to Passing
- Complete 500+ practice questions
- Score 80%+ consistently before scheduling
- Focus on highest-weighted sections
- Use our AI tutor for tough concepts
ICO Visual Sciences Study Tips from Top Performers
Frequently Asked Questions
How many questions are on the ICO Visual Sciences (Part A) examination?
The examination has 120 single-best-answer multiple-choice questions. Each question has four options with one best answer, and the paper is sat over three hours.
Is there negative marking on the ICO Visual Sciences exam?
No. A positive mark is awarded for each correct answer, and no mark is given for incorrect or unanswered questions, so there is no penalty for guessing.
What subjects does the Visual Sciences (Part A) exam cover?
It covers optics, ocular anatomy and embryology, neuro-anatomy, vision and ocular physiology, biochemistry and cell biology, genetics, pathology, microbiology, immunology, pharmacology, and epidemiology and statistics.
How is Part A different from the other ICO examinations?
Part A (Visual Sciences) tests basic and visual sciences. Optics, Refraction and Instruments is a separate examination, and Clinical Ophthalmology (Part C) tests applied clinical knowledge and management.
When is the Visual Sciences exam usually taken?
It is frequently taken early in ophthalmology residency because it tests foundational basic-science knowledge rather than clinical management, making it a logical first ICO examination for many trainees.
Are these official ICO examination questions?
No. These are original OpenExamPrep practice questions modelled on the ICO Visual Sciences syllabus. Official ICO examination questions and resources are provided separately by the International Council of Ophthalmology.