NBEO Part I study guide
NBEO Part I · Work through your exam, one topic at a time.
NBEO Part I, the Applied Basic Science Examination, is the first computer-delivered board examination in the sequence leading to licensure as an optometrist in the United States. It is written for students who have completed the basic science portion of their optometry curriculum and tests whether they can apply foundational science to clinical situations rather than simply recall it. The NBEO Part I study guide has 12 sections and about 3,286 words.
01Anatomy and Histology of the Visual System
This domain tests structure-function relationships from the tear film and cornea through the retina, optic nerve, chiasm, and postchiasmal visual pathways. Expect layered anatomy, vascular supply, extraocular muscle actions, and lesion localization.
306 words, about 2 min02Ocular Physiology and Biochemistry
This domain tests fluid dynamics, corneal clarity, photoreceptor biochemistry, and metabolic support of ocular tissues. Questions often combine a formula with a clinical scenario.
285 words, about 1 min03General and Ocular Microbiology and Immunology
This domain tests host defenses, ocular surface flora, common pathogens, and hypersensitivity mechanisms. Expect organism-to-syndrome matching and immune-privilege concepts.
271 words, about 1 min04General and Ocular Pathology
This domain tests general pathologic processes and their ocular manifestations: injury, inflammation, repair, degeneration, and neoplasia. Questions emphasize pattern recognition and clinicopathologic correlation.
270 words, about 1 min05Ocular Pharmacology and Toxicology
This domain tests drug classes, ocular pharmacokinetics, therapeutic indications, and toxicities. Expect mechanism-based questions and contraindication recognition.
257 words, about 1 min06Geometrical and Physical Optics
This domain tests refraction at surfaces, lens and mirror imaging, prisms, and physical optics including diffraction and polarization. Calculations and sign conventions are common.
283 words, about 1 min07Visual Perception and Psychophysics
This domain tests how the visual system encodes luminance, contrast, spatial detail, color, motion, and depth, plus the psychophysical methods used to measure these functions. Snellen acuity compares a patient's minimum angle of resolution to a standard.
295 words, about 1 min08Ocular Motility and Binocular Vision
This domain tests extraocular muscle actions, innervation, strabismus, sensory adaptation, and binocular testing. Lesion localization and comitance are high-yield.
280 words, about 1 min09Refraction and Clinical Optometric Science
This domain tests refractive error classification, objective and subjective refraction, astigmatism, presbyopia, and clinical optics. Accuracy with cylinder and working distance is essential.
267 words, about 1 min10Systemic Disease and Ocular Manifestations
This domain tests systemic diseases with ocular manifestations and the urgency of referral. Diabetes, hypertension, thyroid disease, and giant cell arteritis are highest yield.
249 words, about 1 min11Epidemiology, Biostatistics, and Research Methods
This domain tests epidemiologic measures, study design, diagnostic test interpretation, and basic inference. Calculation questions reward careful table reading.
267 words, about 1 min12Professional, Ethical, and Legal Foundations
This domain tests informed consent, confidentiality, documentation, scope of practice, and ethical decision-making. Questions often hinge on the next best professional action.
256 words, about 1 min