100+ Free VTS (Ophthalmology) Practice Questions

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Question 1

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How many layers make up the precorneal tear film?

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2026 Statistics

Key Facts: VTS (Ophthalmology) Exam

100

FREE Practice Questions

OpenExamPrep VTS (Ophthalmology) question bank

~$300

2026 Exam Fee

AVOT fee schedule (verify at avot-vts.org)

3 yr

Experience Required

3+ years of ophthalmic practice with credentialed technician status

40+

Case Logs + CE

40 case experiences + 4 case reports + 40 ophthalmology CE hours

Case Reports

Detailed case reports demonstrating advanced ophthalmic decision-making

Provisional

NAVTA CVTS Recognition

AVOT is provisionally recognized by NAVTA's Committee on Veterinary Technician Specialties

The VTS (Ophthalmology) examination is a written computer-based specialty credentialing exam from the Academy of Veterinary Ophthalmic Technicians (AVOT), which is provisionally recognized by NAVTA CVTS. The ~$300 exam covers ocular anatomy/physiology, ophthalmic diagnostics, corneal disease, glaucoma/uveitis, lens and retinal disease, eyelid/adnexal surgery, ophthalmic anesthesia, ocular emergencies, and pharmacology. Eligibility requires CVT/LVT/RVT credential, 3+ years of ophthalmic practice, 40+ case logs, 4 case reports, and 40+ hours of ophthalmology-specific CE.

Sample VTS (Ophthalmology) Practice Questions

Try these sample questions to test your VTS (Ophthalmology) exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1How many layers make up the precorneal tear film?

A.2

B.3

C.4

D.5

Explanation: The precorneal tear film has three layers: an outer lipid layer from the meibomian glands, a middle aqueous layer from the lacrimal and nictitans glands, and an inner mucin layer from conjunctival goblet cells.

2How many layers does the cornea have?

A.2

B.3

C.4

D.6

Explanation: The cornea has four layers: epithelium, stroma, Descemet's membrane, and endothelium. Bowman's layer, present in primates, is absent in most domestic species.

3A normal Schirmer tear test I value in the dog is:

A.> 5 mm/min

B.> 9 mm/min

C.> 15 mm/min

D.> 25 mm/min

Explanation: Normal Schirmer tear test I in the dog is greater than 15 mm/min. Values between 10-14 mm/min are considered early/suspicious KCS, and less than 10 mm/min is diagnostic for KCS with clinical signs.

4Normal intraocular pressure (IOP) in dogs and cats is approximately:

A.5-10 mmHg

B.15-25 mmHg

C.30-40 mmHg

D.40-60 mmHg

Explanation: Normal IOP in dogs and cats is 15-25 mmHg. Values persistently above 25 mmHg suggest glaucoma, while values below 10 mmHg are consistent with uveitis.

5Which stain is used to diagnose corneal ulceration?

A.Rose bengal

B.Fluorescein

C.Lissamine green

D.Methylene blue

Explanation: Fluorescein stain binds to exposed corneal stroma (hydrophilic) but not to intact epithelium or Descemet's membrane. It is the standard stain for diagnosing corneal ulceration.

6The third eyelid (nictitating membrane) is supported by cartilage shaped like a:

A.Y

B.T

C.L

D.V

Explanation: The third eyelid is supported by T-shaped hyaline cartilage. The horizontal bar of the T runs along the leading edge of the nictitans.

7Cherry eye is prolapse of which structure?

A.Iris

B.Lacrimal gland of the third eyelid

C.Lens

D.Meibomian gland

Explanation: Cherry eye is prolapse of the gland of the third eyelid (nictitans gland). It produces approximately 30-50% of aqueous tear production, so surgical replacement (not excision) is the treatment of choice.

8The tapetum lucidum is located in which layer of the eye?

A.Sclera

B.Choroid

C.Retina

D.Cornea

Explanation: The tapetum lucidum is a reflective layer within the choroid, located dorsal to the optic disc. It enhances low-light vision by reflecting light back through the retina.

9Which topical drug is used to treat keratoconjunctivitis sicca (KCS) in dogs?

A.Dorzolamide

B.Cyclosporine

C.Atropine

D.Timolol

Explanation: Cyclosporine (Optimmune) is the standard treatment for canine KCS. It is an immunomodulator that suppresses the autoimmune lacrimal adenitis and stimulates tear production.

10Which of the following is a mydriatic that also provides cycloplegia?

A.Phenylephrine

B.Tropicamide

C.Atropine

D.Pilocarpine

Explanation: Atropine is a long-acting parasympatholytic that produces both mydriasis (pupil dilation) and cycloplegia (ciliary muscle paralysis). It is commonly used in uveitis to reduce pain and prevent synechiae.

About the VTS (Ophthalmology) Exam

The VTS (Ophthalmology) credential from AVOT is the advanced veterinary technician specialty designation in ophthalmology. AVOT is provisionally recognized by NAVTA's Committee on Veterinary Technician Specialties (CVTS). Candidates must hold an active CVT/LVT/RVT credential, document 3+ years and substantive ophthalmic caseload, submit 40+ case logs and 4 case reports, and complete 40+ hours of ophthalmology CE before the written exam. Content covers ocular anatomy (cornea 4 layers, uveal tract, lens zonules, retina/tapetum, optic disc species variation) and physiology (3-layer tear film, aqueous humor outflow, PLR/menace/dazzle), diagnostics (Schirmer, fluorescein, rose bengal, Seidel test, rebound/applanation tonometry, gonioscopy, ERG, ocular ultrasound, indirect ophthalmoscopy with 20D/28D/90D condensing lenses), diseases (SCCED/indolent, melting ulcer with MMPs, descemetocele, KCS autoimmune vs neurogenic, FHV-1 conjunctivitis, primary vs secondary glaucoma, anterior/posterior uveitis with infectious workup, ERU/moon blindness, cataract/phaco, anterior lens luxation emergency, retinal detachment from feline systemic hypertension, PRA, SARDS, cherry eye Morgan pocket, entropion Hotz-Celsus, proptosis), surgical assistance (enucleation, conjunctival pedicle graft, phacoemulsification), ophthalmic anesthesia requiring neuromuscular blockade for central gaze, emergencies (proptosis, descemetocele, acute glaucoma, chemical burns), and pharmacology (cyclosporine/tacrolimus, antifungals, serum, antivirals, anti-glaucoma classes, topical NSAIDs/steroids contraindications with ulcer).

Questions

100 scored questions

Time Limit

Written computer-based examination (~3-4 hours)

Passing Score

Criterion-referenced scaled score set by AVOT (candidates measured against a fixed content-expert standard)

Exam Fee

~$300 exam fee (AVOT 2026 — verify current schedule at avot-vts.org) (Academy of Veterinary Ophthalmic Technicians (AVOT) — provisionally recognized by NAVTA CVTS)

VTS (Ophthalmology) Exam Content Outline

~12%

Ocular Anatomy & Physiology

Eyelid/nictitans/meibomian glands, conjunctiva, lacrimal system, 4-layer cornea (epithelium, stroma, Descemet's, endothelium), limbus/sclera, anterior chamber/iridocorneal angle/pectinate ligament, iris, ciliary body, lens zonules, vitreous, retina (neurosensory + RPE), choroid, tapetum, optic disc species variation (round dog, horizontal cat, round horse). Physiology — 3-layer tear film (mucin, aqueous, lipid), aqueous production and conventional/uveoscleral outflow, PLR direct/consensual, dazzle, cortical menace response (develops 10-12 weeks).

~14%

Diagnostic Techniques

Schirmer tear test (STT-1 dog >15 mm/min, cat >9 mm/min; STT-2 after topical anesthetic), fluorescein stain (ulcer, Seidel test for perforation, NLD patency), rose bengal. Tonometry — Schiötz, applanation (Tonopen), rebound (TonoVet); normal IOP dog/cat 15-25, horse 15-30 mmHg. Ocular ultrasound B-mode (retinal detachment, lens luxation, intraocular mass). ERG for SARDS and PRA. Gonioscopy, indirect ophthalmoscopy with 20D/28D/90D condensing lens, slit lamp biomicroscopy, OCT (referral), corneal culture and sensitivity.

~12%

Corneal Disease

Superficial vs stromal ulcer vs descemetocele vs perforation. SCCED/indolent 'boxer' ulcer — debridement + grid or diamond burr keratotomy. Melting ulcer — MMP collagenases treated with autologous/homologous serum, EDTA, N-acetylcysteine, doxycycline. Bacterial and fungal (equine) infected ulcers. Neurotrophic and burn ulcers. KCS — autoimmune lacrimal adenitis treated with topical cyclosporine (Optimmune) or tacrolimus; neurogenic KCS (unilateral dry eye + dry nostril, CN VII) responds to pilocarpine. FHV-1 feline conjunctivitis — famciclovir PO, cidofovir/idoxuridine/trifluridine topical; adenovirus in dogs; allergic conjunctivitis.

~12%

Glaucoma & Uveitis

Primary glaucoma breeds (Cocker, Basset, Beagle, Chow, Arctic Circle). Secondary glaucoma from uveitis or lens luxation. Clinical signs — episcleral injection, corneal edema, mydriasis, buphthalmos (chronic), blindness. Treatment — topical CAIs (dorzolamide/brinzolamide), beta-blockers (timolol/betaxolol), alpha-2 (brimonidine), PG analogs (latanoprost — CONTRAINDICATED with anterior lens luxation), IV mannitol emergency, laser cyclophotocoagulation, gonioimplants, enucleation. Uveitis — anterior (flare, miosis, hypopyon, hyphema, LOW IOP), posterior (chorioretinitis, retinal detachment). Infectious workup — feline (FIP, FeLV, FIV, toxoplasma), canine (ehrlichia, RMSF, blastomycosis, leptospirosis). Equine recurrent uveitis (ERU/moon blindness) — leptospirosis, suprachoroidal cyclosporine implant.

~10%

Lens, Retinal & Posterior Segment Disease

Cataract — congenital, juvenile, senile, diabetic (rapid in dogs), traumatic; mature/hypermature lens-induced uveitis; phacoemulsification with IOL (referral). Primary lens luxation — terrier breeds, ADAMTS17 gene (Jack Russell, Fox Terrier); ANTERIOR lens luxation = emergency surgical extraction. Retinal detachment — rhegmatogenous, exudative (feline systemic hypertension is the most common cause — CHECK BP IMMEDIATELY). PRA breed-specific, irreversible, early night blindness, CERF/OFA screening. SARDS — sudden blindness, flat ERG, no structural change, no effective treatment.

~10%

Eyelid, Third Eyelid & External Disease

Cherry eye — prolapse of gland of third eyelid; surgical REPLACEMENT via Morgan pocket technique, NOT excision (excision predisposes to KCS). Entropion — Hotz-Celsus arc-shaped skin resection. Ectropion — V-Y blepharoplasty. Distichiasis — electroepilation or cryoepilation; ectopic cilia excised from palpebral conjunctiva. Eyelid mass removal with wedge/pentagonal/house-shape resection. Proptosis — EMERGENCY, reduction within 2 hours with lateral canthotomy and temporary tarsorrhaphy; brachycephalic predisposition; dark menace and negative dazzle are poor vision prognostics.

~10%

Ophthalmic Surgery & Anesthesia

Instrument handling and surgical assistance — entropion/ectropion repair, third eyelid gland replacement, eyelid mass removal, distichiasis, transconjunctival/transpalpebral enucleation, evisceration with intrascleral prosthesis, conjunctival pedicle graft, conjunctival island graft, keratectomy, corneoconjunctival transposition, penetrating keratoplasty (referral), phacoemulsification/IOL, glaucoma drainage implants. Ophthalmic anesthesia — CENTRAL eye required, achieved with neuromuscular blockers atracurium or rocuronium (train-of-four monitoring, reversal with neostigmine + glycopyrrolate or sugammadex). Topical proparacaine/tetracaine. Avoid ketamine in glaucoma (raises IOP).

~8%

Ocular Emergencies

Proptosis, deep stromal ulcer and descemetocele, perforated globe, acute glaucoma, acute blindness (SARDS vs PRA vs retinal detachment with BP check vs optic neuritis), hyphema, chemical exposure (flush with sterile saline or LRS for a minimum of 20 minutes; check pH). Red-flag triage for same-day DACVO referral.

~12%

Ophthalmic Pharmacology

Topicals — cyclosporine (Optimmune), tacrolimus (compounded), antibiotics (tobramycin, neomycin-polymyxin-gramicidin, ciprofloxacin, moxifloxacin), antifungals (natamycin, voriconazole, miconazole), antivirals (cidofovir, idoxuridine, trifluridine; famciclovir PO for FHV-1), artificial tears, mucolytic NAC, MMP inhibitor doxycycline, autologous/homologous serum. Mydriatics — tropicamide (short), atropine (long — uveitis to break synechiae; CONTRAINDICATED in glaucoma), phenylephrine. Miotic pilocarpine (rarely, neurogenic KCS). Anti-glaucoma — PG analogs (latanoprost), beta-blockers (timolol, betaxolol), topical CAIs (dorzolamide, brinzolamide), alpha-2 (brimonidine), oral methazolamide. Topical NSAIDs (diclofenac, flurbiprofen, ketorolac) and corticosteroids (prednisolone acetate 1%, dexamethasone) must be AVOIDED with active corneal ulceration.

How to Pass the VTS (Ophthalmology) Exam

What You Need to Know

Passing score: Criterion-referenced scaled score set by AVOT (candidates measured against a fixed content-expert standard)
Exam length: 100 questions
Time limit: Written computer-based examination (~3-4 hours)
Exam fee: ~$300 exam fee (AVOT 2026 — verify current schedule at avot-vts.org)

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

VTS (Ophthalmology) Study Tips from Top Performers

1Memorize normal diagnostic values cold — Schirmer tear test STT-1 in a normal dog is >15 mm/min and a normal cat is >9 mm/min; IOP by rebound or applanation tonometry is 15-25 mmHg in dogs and cats and 15-30 mmHg in horses. Be ready to recognize KCS when dog STT drops below 10 mm/min (mild-moderate 6-10, severe <5) and to flag IOP >25 mmHg with clinical signs as acute glaucoma needing emergency therapy.

2SCCED/indolent ('boxer') ulcer management is highly testable — a superficial non-healing ulcer with loose epithelial lip in a middle-aged dog is treated with cotton-tip debridement of loose epithelium followed by grid or diamond burr keratotomy. DO NOT debride a deep stromal ulcer or descemetocele. Melting ulcers driven by matrix metalloproteinases (MMPs) are treated with autologous/homologous SERUM (growth factors + anti-protease activity), topical EDTA, N-acetylcysteine, and systemic doxycycline.

3Know the glaucoma drug class contraindications — latanoprost and other prostaglandin analogs are CONTRAINDICATED with anterior lens luxation (further pushes lens forward), and ATROPINE is contraindicated with glaucoma (deepens mydriasis and worsens angle closure). ATROPINE is otherwise used in uveitis to break posterior synechiae and relieve painful ciliary spasm. Topical NSAIDs and corticosteroids must be AVOIDED with active corneal ulceration (impair healing, potentiate melting/infection).

4For acute blindness in a cat, MEASURE BLOOD PRESSURE IMMEDIATELY — systemic hypertension (often secondary to CKD or hyperthyroidism) is the most common cause of bilateral exudative retinal detachment and acute blindness. Amlodipine is first-line. Other differentials for acute blindness include SARDS (sudden, flat ERG, non-structural — no treatment), PRA (progressive with night blindness first), and optic neuritis.

5Cherry eye (prolapsed gland of the third eyelid) is treated with surgical REPLACEMENT via the Morgan pocket technique, NOT excision — excising the gland predisposes the dog to KCS later in life because this gland produces 30-50% of the aqueous tear film. Proptosis is an EMERGENCY requiring reduction within 2 hours via lateral canthotomy and temporary tarsorrhaphy; brachycephalics (Pugs, Shih Tzus, Boston Terriers) are predisposed. Dark menace and negative dazzle reflex at presentation are poor prognostic signs for vision return.

Frequently Asked Questions

What is the VTS (Ophthalmology) credential?

The VTS (Ophthalmology) credential is an advanced veterinary technician specialty awarded by the Academy of Veterinary Ophthalmic Technicians (AVOT). AVOT is provisionally recognized by NAVTA's Committee on Veterinary Technician Specialties (CVTS). Candidates demonstrate advanced knowledge and skills in veterinary ophthalmology through case logs, case reports, continuing education, and a written examination.

Who is eligible to sit for the AVOT exam?

Candidates must hold an active credential as CVT/LVT/RVT (or state equivalent), have at least 3 years of full-time experience with substantive ophthalmic caseload within the past 5 years, log 40+ advanced ophthalmic case experiences, submit 4 detailed case reports, complete 40+ hours of ophthalmology-specific continuing education, and secure 2 letters of recommendation (ideally from a DACVO and a supervising veterinarian or VTS). Applications must be approved by AVOT before scheduling the exam.

What is the format of the VTS (Ophthalmology) exam?

The AVOT credentialing exam is a written computer-based examination covering veterinary ophthalmology content. Items are single-best-answer multiple-choice questions with case-based vignettes across ocular anatomy/physiology, diagnostics, corneal disease, glaucoma/uveitis, lens and retinal disease, eyelid and third eyelid surgery, ophthalmic anesthesia, ocular emergencies, and pharmacology.

How much does the 2026 VTS (Ophthalmology) exam cost?

The AVOT exam fee is approximately $300 for 2026 — always verify the current schedule on avot-vts.org. Candidates also pay an application review fee, CE course costs (typically $500-$1,500 to meet the 40-hour ophthalmology CE requirement), and annual AVOT/NAVTA membership dues. Retakes require re-registration and fee payment per AVOT policy.

When is the 2026 exam administered?

The AVOT written examination is typically offered once per year in a designated testing window, often timed around major veterinary ophthalmology conferences (ACVO annual meeting). Credentials applications are due several months before the exam date. Confirm 2026 dates and application deadlines on avot-vts.org.

How is the exam scored?

AVOT uses criterion-referenced scaled scoring with a passing standard set by subject-matter experts. A candidate's pass/fail result depends on performance against a fixed cut-score, not against peers. Candidates must pass the written examination to earn the VTS (Ophthalmology) designation.

What are the highest-yield topics?

Highest-yield topics include normal Schirmer tear test values (dog >15 mm/min, cat >9 mm/min), tonometry IOP ranges (dog/cat 15-25, horse 15-30 mmHg), SCCED/indolent ulcer management (debridement + grid keratotomy), melting ulcer MMP treatment with serum and doxycycline, KCS topical cyclosporine, FHV-1 famciclovir PO, the glaucoma drug classes (avoid latanoprost in anterior lens luxation, atropine contraindicated in glaucoma), anterior lens luxation as a surgical emergency, feline systemic hypertension as the top cause of exudative retinal detachment, cherry eye Morgan pocket (NOT excision), proptosis 2-hour reduction window, and neuromuscular blockade for central gaze in intraocular surgery.

How should I study for this exam?

Build ophthalmic case logs and refine 4 case reports over 12-18 months working with or rotating through a DACVO. Complete 40+ hours of ophthalmology CE across medical, surgical, and diagnostic topics. Use Slatter's Fundamentals of Veterinary Ophthalmology (Maggs, Miller, Ofri), Gelatt's Veterinary Ophthalmology, Plumb's Veterinary Drug Handbook, and AVOT-recommended resources. Dedicate 3-6 months of final review with high-volume MCQ practice and 2-3 timed full-length mock exams.