BIOCHEMICAL COMPONENTS

Vascular Endothelial Growth Factor

Which hypoxia-induced growth factor is released by ischemic retinal tissue to stimulate angiogenesis and pathologic neovascularization?

Bevacizumab

Which repurposed monoclonal antibody anti-cancer drug is injected intravitreally as an anti-VEGF agent to inhibit neovascular growth and vessel leakage in wet ARMD?

Pegaptanib

Which selective anti-VEGF aptamer specifically targets and binds the VEGF165 isoform in neovascular age-related macular degeneration?

Ranibizumab

Which monoclonal antibody fragment functions as an anti-VEGF agent to suppress pathologic ocular neovascularization?

Sodium fluorescein

Which fluorescent dye absorbs blue light at 465 to 490 nm and emits yellow-green light at 530 nm to evaluate ocular circulation, corneal defects, and tear film breakup time?

Albumin

Which predominant plasma protein binds approximately 80 percent of circulating sodium fluorescein dye during fluorescein angiography?

Indocyanine green

Which tricarbocyanine dye binds heavily to plasma proteins and is used in angiography to image the deeper choroidal circulation?

Trypan blue

Which vital dye stains the anterior lens capsule blue to facilitate capsulorhexis visualization during cataract surgery?

Lissamine green

Which vital stain colors devitalized epithelial cells, mucin-deficient areas, and lid wiper margins green without causing ocular stinging?

Rose bengal

Which synthetic dye stains devitalized ocular surface epithelial cells and mucus, but can cause mild stinging upon topical instillation?

Cyclosporine A

Which calcineurin inhibitor immunomodulating drug suppresses T-cell activation and inflammation on the ocular surface in chronic dry eye disease?

Loteprednol etabonate

Which ester prodrug corticosteroid undergoes predictable metabolic inactivation by endogenous ocular esterases to reduce systemic and intraocular side effects?

Prednisolone acetate

Which topical corticosteroid suspension is used to control severe intraocular and ocular surface inflammation?

Dexamethasone

Which potent corticosteroid is used topically or systemically to suppress ocular inflammation but carries a risk of inducing cataracts and elevated intraocular pressure?

Mitomycin-C

Which antimetabolite chemical agent is applied topically during endoscopic dacryocystorhinostomy or trabeculectomy to inhibit fibroblast proliferation and prevent fistula scarring?

5-Fluorouracil

Which pyrimidine analog antimetabolite is applied during glaucoma filtration surgery to inhibit fibroblast proliferation and prevent failure of the filtration bleb?

Actinomyces species

Which anaerobic filamentous Gram-positive bacterium is the primary causative organism of canaliculitis associated with yellowish dacryolith formation?

Toxocara canis

Which canine roundworm parasite releases eggs ingested by humans via contaminated soil, leading to ocular larva migrans and retinal granuloma formation?

Toxocara cati

Which feline roundworm nematode causes human ocular toxocariasis through ingestion of infective eggs passed in cat feces?

Toxoplasma gondii

Which obligate intracellular protozoan parasite utilizes cats as definitive hosts and causes focal necrotizing retinitis or retinochoroiditis?

RB1 gene

Which tumor suppressor gene located on chromosome 13q14 undergoes mutational inactivation leading to the development of retinoblastoma?

Rb protein

Which cell cycle regulatory nuclear protein encoded by the RB1 gene prevents excessive cell proliferation by inhibiting E2F transcription factors?

Thyroid Stimulating Immunoglobulins

Which autoantibodies target thyroid-stimulating hormone receptors, driving glycosaminoglycan accumulation and orbital muscle swelling in thyroid-related eye disease?

TSH receptor

Which G-protein coupled receptor on orbital fibroblasts and thyroid follicular cells is targeted by autoantibodies in thyroid eye disease?

Lysozyme

Which antibacterial enzyme in tears hydrolyzes 1,4-beta-linkages in peptidoglycan cell walls of Gram-positive bacteria?

Lactoferrin

Which iron-binding glycoprotein secreted by lacrimal glands exerts bacteriostatic effects on the ocular surface by chelating free ferric iron?

Tear lipocalin

Which lipid-binding transport protein in tears solubilizes lipids, reduces surface tension, and contributes to tear film stability?

Lacritin

Which tear glycoprotein secreted by lacrimal acinar cells promotes basal lacrimal secretion and corneal epithelial cell renewal?

Secretory IgA

Which primary mucosal immunoglobulin in tears neutralizes pathogens and prevents microbial adherence to the ocular surface?

MUC5AC

Which gel-forming secreted mucin synthesized by conjunctival goblet cells lubricates the ocular surface and forms the mucous layer of the tear film?

Glycocalyx mucins

Which membrane-bound mucins including MUC1, MUC4, and MUC16 on corneal and conjunctival epithelial cells provide a hydrophilic surface for tear film spreading?

Matrix metalloproteinases

Which zinc-dependent endopeptidase enzymes are elevated in hyperosmolar tears and cleave extracellular matrix components causing epithelial cell damage?

Interleukin-1

Which proinflammatory cytokine is upregulated on the ocular surface in dry eye disease, promoting epithelial cell apoptosis?

Interleukin-17

Which inflammatory cytokine secreted by Th17 cells drives corneal barrier disruption and autoimmunity in chronic ocular surface inflammation?

Interferon-gamma

Which pro-inflammatory cytokine induces goblet cell loss and squamous metaplasia on the conjunctival epithelium in dry eye disease?

Tumor Necrosis Factor-alpha

Which inflammatory mediator secreted by stressed epithelial and immune cells amplifies apoptosis and tissue destruction in dry eye disease?

Doxycycline

Which tetracycline class antibiotic inhibits matrix metalloproteinases and decreases bacterial lipase production in anterior blepharitis and meibomian gland dysfunction?

Azithromycin

Which macrolide antibiotic exerts anti-inflammatory properties and inhibits bacterial protein synthesis, used topically or orally for meibomian gland dysfunction?

Selenium sulfide

Which topical antifungal and antiseborrheic chemical agent is used in lid margin hygiene for meibomian gland dysfunction?

Mannitol

Which hyperosmotic intravenous carbohydrate solution lowers intraocular pressure rapidly by drawing fluid from the vitreous body into the intravascular space?

Acetazolamide

Which systemic carbonic anhydrase inhibitor blocks ciliary epithelial carbonic anhydrase isoenzyme II to suppress bicarbonate formation and aqueous humor secretion?

Dorzolamide

Which topical carbonic anhydrase inhibitor decreases intraocular pressure by inhibiting ciliary epithelial carbonic anhydrase II without systemic side effects?

Carbonic anhydrase isoenzyme II

Which ciliary epithelial zinc metalloenzyme catalyzes the reversible hydration of carbon dioxide to produce bicarbonate for aqueous humor formation?

Timolol

Which non-selective beta-adrenergic receptor antagonist lowers intraocular pressure by suppressing cAMP-mediated aqueous humor secretion by the ciliary epithelium?

Betaxolol

Which cardioselective beta-1 adrenergic antagonist eye drop reduces aqueous humor production with fewer pulmonary side effects than non-selective beta blockers?

Brimonidine

Which selective alpha-2 adrenergic agonist lowers intraocular pressure via Gi protein coupling to decrease intracellular cAMP and increase uveoscleral outflow?

Apraclonidine

Which polar alpha-2 adrenergic agonist lowers intraocular pressure post-laser without crossing the blood-brain barrier due to high ionization at physiological pH?

Gi protein

Which heterotrimeric G-protein subunit is activated by alpha-2 adrenergic stimulation to inhibit adenylyl cyclase and decrease cAMP production in ciliary cells?

Latanoprost

Which ester prodrug prostaglandin F2-alpha analog increases uveoscleral aqueous outflow by remodeling extracellular matrix in the ciliary muscle?

Bimatoprost

Which synthetic prostamide analog enhances both uveoscleral and trabecular aqueous humor outflow to lower intraocular pressure?

Travoprost

Which isopropyl ester prostaglandin F2-alpha agonist selectively stimulates FP prostanoid receptors to lower intraocular pressure?

Tafluprost

Which fluorinated prostaglandin F2-alpha analog provides preservative-free IOP lowering by enhancing uveoscleral outflow?

FP prostanoid receptor

Which Gq-coupled prostanoid receptor subtype on ciliary muscle cells mediates matrix metalloproteinase induction and increased uveoscleral outflow?

Pilocarpine

Which direct-acting muscarinic M3 receptor agonist contracts the ciliary muscle and iris sphincter to pull open the trabecular meshwork and lower IOP?

Muscarinic M3 receptor

Which G-protein coupled receptor on the iris sphincter and ciliary muscle mediates miosis and accommodation upon cholinergic stimulation?

Alpha-1 adrenergic receptor

Which Gq-coupled adrenergic receptor on the iris dilator muscle mediates pupillary dilation upon sympathetic stimulation?

Botulinum toxin

Which bacterial neurotoxin cleaves SNAP-25 or synaptobrevin proteins to block presynaptic acetylcholine release at the neuromuscular junction?

Hyaluronic acid

Which high-molecular-weight glycosaminoglycan polysaccharide acts as a viscoelastic lubricant in artificial tears and vitreous substitute?

Epinephrine

Which non-selective alpha and beta adrenergic agonist is combined with lidocaine to induce vasoconstriction and hemostasis during DCR surgery?

Lidocaine

Which voltage-gated sodium channel blocker local anesthetic prevents neuronal action potential conduction during ophthalmic procedures?

Vitamin A

Which essential fat-soluble micronutrient is required for rhodopsin synthesis and maintenance of mucosal goblet cells, preventing Bitot spots?

Vitamin C

Which water-soluble antioxidant nutrient in the AREDS2 formulation scavenges free radicals in ocular tissues?

Vitamin E

Which lipid-soluble antioxidant vitamin in AREDS2 protects cell membranes from lipid peroxidation in retinal tissues?

Lutein

Which dietary carotenoid pigment selectively accumulates in the macula to filter blue light and neutralize reactive oxygen species?

Zeaxanthin

Which macular carotenoid isomer concentrated in the central fovea protects photoreceptors against phototoxic blue light damage?

Zinc

Which essential trace element in AREDS2 serves as a cofactor for retinal enzymes including alcohol dehydrogenase and superoxide dismutase?

Copper

Which essential mineral element is added to AREDS2 formulations to prevent zinc-induced microcytic anemia?

Collagen

Which triple-helical fibrous structural protein constitutes the primary extracellular matrix of the sclera, cornea, and tarsal plate?

Elastin

Which connective tissue protein provides elastic recoil to eyelid skin and orbital tissues, undergoing degeneration in dermatochalasis?

Lipofuscin

Which autofluorescent bisretinoid waste product accumulates within retinal pigment epithelium lysosomes as a consequence of aging and photoreceptor outer segment phagocytosis?

Melanin

Which light-absorbing pigment in RPE cells and choroid absorbs scattered photons and protects against light-induced oxidative injury?

Cholesterol

Which lipid molecule accumulates in subretinal exudates in Coats disease due to incompetence of abnormal telangiectatic retinal vessels?

Bicarbonate

Which inorganic anion actively secreted into the posterior chamber by ciliary epithelial cells draws sodium and water to form aqueous humor?

Sodium

Which principal extracellular cation is actively transported by Na+/K+-ATPase pumps across ciliary nonpigmented epithelium into aqueous humor?

Potassium

Which intracellular cation is present in tear fluid and essential for maintaining corneal epithelial cell membrane potential?

Chloride

Which major inorganic anion co-transported across ciliary epithelial membranes maintains osmotic balance in aqueous humor secretion?

High-frequency acoustic waves

Which physical acoustic signal above 20 kHz is utilized in B-scan ultrasonography to visualize internal structures in opaque media?

Toxoplasma oocysts

Which environmentally resistant parasitic cyst stage shed in cat feces serves as the infective vehicle for acquired toxoplasmosis?

Demodex species

Which ectoparasitic eyelid mites cause anterior blepharitis characterized by cylindrical dandruff collarettes at the base of eyelashes?

Staphylococcus aureus

Which Gram-positive bacterium produces exotoxins and lipases causing staphylococcal anterior blepharitis and external hordeola?

Staphylococcus epidermidis

Which commensal skin bacterium can infect Meibomian or Zeiss glands, leading to acute hordeolum formation?

Pseudomonas aeruginosa

Which opportunistic Gram-negative bacterium produces elastase and exotoxin A, causing rapidly destructive keratitis and corneal melting?

Herpes simplex virus

Which neurotropic DNA virus causes dendritic corneal epithelial keratitis and neurotrophic keratopathy?

Chlamydia trachomatis

Which obligate intracellular bacterium causes inclusion conjunctivitis and trachoma with follicular conjunctivitis?

Human papillomavirus

Which DNA virus causes conjunctival papillomas and punctal/canalicular stenosis?

Cytomegalovirus

Which opportunistic herpesvirus causes necrotizing retinitis in immunocompromised hosts as part of TORCH infections?

Rubella virus

Which RNA virus infection during maternal pregnancy causes congenital cataract, microphthalmia, and salt-and-pepper retinopathy?

Herpes simplex virus type 1

Which TORCH viral agent causes neonatal ocular herpes infection and congenital corneal clouding?

Treponema pallidum

Which spirochete organism crosses the placenta to cause interstitial keratitis and chorioretinitis in congenital syphilis?

Cutibacterium acnes

Which anaerobic skin bacterium induces low-grade inflammation within the capsular bag following cataract surgery?

Chloramphenicol

Which broad-spectrum antibiotic inhibits bacterial 50S ribosomal subunits and can cause iatrogenic punctal stenosis?

Tobramycin

Which aminoglycoside antibiotic inhibits bacterial 30S ribosomal protein synthesis, used topically for corneal ulcers and blepharitis?

Indomethacin

Which non-steroidal anti-inflammatory drug inhibits cyclooxygenase enzymes to manage ocular pain and inflammation?

Phenylephrine

Which selective alpha-1 adrenergic agonist causes iris dilator muscle contraction to induce mydriasis without cycloplegia?

Tropicamide

Which short-acting anticholinergic muscarinic receptor antagonist induces both mydriasis and cycloplegia for ophthalmic examination?

Naphazoline

Which imidazoline alpha-adrenergic agonist induces conjunctival blood vessel constriction to reduce ocular redness?

Dipivefrine

Which lipophilic prodrug of epinephrine undergoes corneal esterase cleavage to lower intraocular pressure?

Echothiophate iodide

Which irreversible organophosphate acetylcholinesterase inhibitor increases endogenous acetylcholine to lower intraocular pressure?

Paclitaxel

Which microtubule-stabilizing chemotherapeutic agent causes iatrogenic canalicular and punctal stenosis via systemic secretion into tears?

Docetaxel

Which taxane antineoplastic drug induces lacrimal duct fibrosis and punctal stenosis through lacrimal excretion?