English for Ophthalmology: Essential Vocabulary & Phrases

"anterior chamber"

The fluid-filled space between the cornea and the iris, containing aqueous humour that nourishes the avascular structures of the eye

"Slit-lamp examination revealed cells and flare in the anterior chamber, consistent with anterior uveitis."

"vitreous humour"

The clear, gel-like substance that fills the large cavity behind the lens, maintaining the shape of the eyeball and supporting the retina

"The patient reported floaters after a posterior vitreous detachment caused debris to move through the vitreous humour."

"macula"

The small, specialised region at the centre of the retina responsible for sharp, central, high-resolution, and colour vision

"OCT imaging showed drusen deposits beneath the macula, indicating early age-related macular degeneration."

"optic disc"

The circular area where the optic nerve exits the retina, also called the optic nerve head; it contains no photoreceptors and creates the physiological blind spot

"Fundoscopy revealed a cup-to-disc ratio of 0.8, prompting urgent referral for glaucoma assessment."

"choroid"

The vascular layer of the eye located between the retina and the sclera, providing oxygen and nutrients to the outer layers of the retina

"Choroidal neovascularisation was identified as the cause of the patient's sudden central visual loss in wet AMD."

"trabecular meshwork"

A sponge-like tissue located at the drainage angle of the eye that regulates the outflow of aqueous humour, thereby controlling intraocular pressure

"Selective laser trabeculoplasty targets the trabecular meshwork to improve aqueous drainage and lower intraocular pressure."

"fovea"

The small pit at the centre of the macula with the highest concentration of cone photoreceptors, responsible for the sharpest central vision

"A macular hole involving the fovea explained the patient's severely reduced visual acuity of 6/60 in the affected eye."

"ciliary body"

The ring-shaped structure behind the iris that produces aqueous humour and controls the shape of the lens through the ciliary muscle for accommodation

"Cyclophotocoagulation targets the ciliary body to reduce aqueous production in refractory glaucoma."

"visual acuity"

A measure of the eye's ability to distinguish fine detail and recognise small objects at a standard distance, typically recorded using Snellen notation

"The patient's best-corrected visual acuity improved from 6/60 to 6/9 after cataract surgery."

"intraocular pressure"

The fluid pressure inside the eye, maintained by the balance between aqueous humour production and drainage; elevated IOP is a major risk factor for glaucoma

"Goldmann applanation tonometry measured an intraocular pressure of 28 mmHg in the right eye, warranting further glaucoma investigation."

"visual field"

The total area in which objects can be seen in the peripheral vision while the eye is focused on a central point; defects in the visual field indicate specific neurological or retinal pathology

"Automated perimetry demonstrated an arcuate scotoma in the superior visual field, characteristic of glaucomatous nerve fibre loss."

"contrast sensitivity"

The ability of the visual system to distinguish between an object and its background when there is limited difference in brightness or colour between them

"The patient complained of difficulty driving at night despite normal visual acuity, so contrast sensitivity testing was performed."

"refraction"

The measurement of the eye's refractive error — including myopia, hyperopia, and astigmatism — to determine the corrective lens prescription needed for clear vision

"Manifest refraction revealed a prescription of −4.25 dioptres sphere combined with −1.00 dioptre cylinder in the left eye."

"colour vision"

The ability of the eye to perceive and distinguish between different wavelengths of light, dependent on three types of cone photoreceptors sensitive to red, green, and blue light

"Ishihara colour vision testing identified a red-green colour deficiency, a common inherited condition affecting 8% of male patients."

"optical coherence tomography"

A non-invasive imaging technology that uses light waves to produce high-resolution cross-sectional images of the retina and other ocular structures in real time

"Optical coherence tomography confirmed intraretinal fluid in the macula, supporting the diagnosis of central serous chorioretinopathy."

"slit-lamp examination"

A biomicroscopic examination using a high-intensity light beam and binocular microscope to inspect the anterior and posterior segments of the eye in high magnification and detail

"Slit-lamp examination with a Volk lens revealed neovascularisation at the disc and vitreous haemorrhage in the diabetic patient."

"glaucoma"

A group of progressive optic neuropathies characterised by damage to the optic nerve, often associated with elevated intraocular pressure, leading to irreversible visual field loss

"The patient was diagnosed with primary open-angle glaucoma after presenting with an elevated cup-to-disc ratio and characteristic visual field defects."

"diabetic retinopathy"

A microvascular complication of diabetes mellitus in which prolonged high blood glucose damages the blood vessels of the retina, potentially causing vision loss

"Annual diabetic retinopathy screening is recommended for all patients with type 2 diabetes from the time of diagnosis."

"age-related macular degeneration"

A progressive deterioration of the macula that occurs with ageing, classified as dry (atrophic) or wet (neovascular); the leading cause of severe vision loss in adults over 60

"The patient was commenced on intravitreal anti-VEGF injections after optical coherence tomography confirmed wet age-related macular degeneration."

"cataract"

A progressive clouding of the crystalline lens of the eye that reduces the passage of light to the retina, causing blurred vision, glare, and eventually severe visual impairment

"The patient's cataract had progressed to the point where phacoemulsification and intraocular lens implantation were recommended to restore functional vision."

"retinal detachment"

A serious ocular emergency in which the neurosensory retina separates from the underlying retinal pigment epithelium, cutting off its blood supply and threatening permanent vision loss

"The patient described a sudden onset of a curtain-like shadow across his vision — a classic symptom of retinal detachment requiring emergency surgery."

"uveitis"

Inflammation of the uveal tract — the iris, ciliary body, and choroid — which can occur as an isolated eye condition or as a manifestation of systemic inflammatory disease

"The rheumatologist referred the patient for ophthalmology review after noting that uveitis is a common extra-articular feature of HLA-B27-associated ankylosing spondylitis."

"keratoconus"

A progressive corneal ectasia in which the cornea gradually thins and bulges forward into a cone shape, causing irregular astigmatism and progressive visual distortion

"Corneal topography confirmed advanced keratoconus, and the patient was referred for cross-linking to halt the progression of corneal thinning."

"amblyopia"

Reduced visual acuity in one eye caused by abnormal visual development in early childhood, typically resulting from strabismus, unequal refractive errors, or visual deprivation

"The six-year-old was diagnosed with amblyopia in the left eye, and occlusion therapy — patching the dominant eye — was prescribed to stimulate visual development."

"phacoemulsification"

The most widely performed cataract surgery technique, using ultrasonic energy delivered through a small incision to emulsify and aspirate the cloudy lens before inserting an artificial intraocular lens

"Phacoemulsification was completed without complications, and a monofocal intraocular lens was implanted through the 2.4 mm clear corneal incision."

"vitrectomy"

A surgical procedure in which the vitreous gel is removed from the vitreous cavity using a small cutting instrument, typically to treat retinal detachment, vitreous haemorrhage, or macular holes

"Pars plana vitrectomy combined with membrane peeling successfully relieved the tractional forces causing the macular pucker."

"trabeculectomy"

A filtration surgery for glaucoma that creates a new drainage pathway from the anterior chamber to the subconjunctival space, forming a filtering bleb to lower intraocular pressure

"After maximum tolerated medical therapy failed to control her IOP, trabeculectomy was performed, achieving a target pressure below 15 mmHg."

"intravitreal injection"

The direct injection of a therapeutic agent — such as anti-VEGF drugs, corticosteroids, or antibiotics — into the vitreous cavity to achieve high drug concentrations at the retina

"The patient received monthly intravitreal injections of ranibizumab for neovascular age-related macular degeneration over a six-month loading phase."

"LASIK"

Laser-assisted in-situ keratomileusis: a refractive surgery procedure that uses an excimer laser to reshape the corneal stroma beneath a hinged flap to correct myopia, hyperopia, or astigmatism

"LASIK reduced the patient's prescription from −6.00 dioptres to plano, eliminating his need for spectacles or contact lenses."

"corneal transplant"

A surgical procedure — also called keratoplasty — in which diseased or damaged corneal tissue is replaced with healthy donor corneal tissue to restore vision and corneal integrity

"Descemet membrane endothelial keratoplasty was selected over penetrating keratoplasty as the preferred corneal transplant technique for Fuchs endothelial dystrophy."

"strabismus surgery"

A surgical procedure that adjusts the tension or position of one or more extraocular muscles to correct misalignment of the eyes — squint — and improve binocular vision

"Strabismus surgery successfully aligned the eyes in the six-year-old, reducing the angle of esotropia from 35 to 4 prism dioptres postoperatively."

"retinal laser photocoagulation"

The application of laser energy to create controlled burns on the retina to seal retinal tears, destroy ischaemic tissue, or reduce neovascularisation in diabetic retinopathy

"Pan-retinal laser photocoagulation was performed over two sessions to treat proliferative diabetic retinopathy and reduce the risk of vitreous haemorrhage."

"anti-VEGF therapy"

A class of treatments that inhibit vascular endothelial growth factor to prevent abnormal blood vessel growth and reduce vascular permeability in conditions such as wet AMD and diabetic macular oedema

"Anti-VEGF therapy with bevacizumab given as monthly intravitreal injections stabilised the patient's vision and resolved the subretinal fluid on OCT."

"prostaglandin analogue"

A class of topical eye drops that lower intraocular pressure by increasing uveoscleral outflow of aqueous humour; commonly used as first-line treatment for primary open-angle glaucoma

"Latanoprost, a prostaglandin analogue instilled once daily at night, reduced the patient's intraocular pressure by 30% from baseline."

"beta-blocker eye drops"

Topical ophthalmic agents that reduce intraocular pressure by decreasing aqueous humour production through beta-adrenergic blockade of the ciliary body epithelium

"Timolol beta-blocker eye drops were contraindicated in the patient with severe asthma, prompting the clinician to select an alternative IOP-lowering agent."

"mydriatic agent"

A drug that dilates the pupil by relaxing the iris sphincter muscle, used for fundal examination, refraction in children, or as part of treatment for anterior uveitis

"Tropicamide 1%, a short-acting mydriatic agent, was instilled to achieve pupil dilation prior to fundoscopy in the diabetic screening clinic."

"corticosteroid eye drops"

Topical anti-inflammatory agents used to suppress ocular inflammation in conditions such as uveitis, post-operative inflammation, and severe allergic conjunctivitis

"Prednisolone acetate corticosteroid eye drops were prescribed hourly in the acute phase of anterior uveitis to reduce intraocular inflammation and prevent synechiae."

"carbonic anhydrase inhibitor"

A class of drugs that lower intraocular pressure by reducing aqueous humour production via inhibition of the carbonic anhydrase enzyme in the ciliary body, available in topical and systemic forms

"Oral acetazolamide, a systemic carbonic anhydrase inhibitor, was used to rapidly lower the extremely elevated intraocular pressure in acute angle-closure glaucoma."

"artificial tears"

Lubricating eye drops used to relieve symptoms of dry eye disease by supplementing the natural tear film and reducing ocular surface desiccation

"Preservative-free artificial tears were recommended four times daily to manage the patient's evaporative dry eye caused by meibomian gland dysfunction."

"antifungal eye drops"

Topical ophthalmic antifungal preparations used to treat fungal keratitis, a serious corneal infection often associated with ocular trauma involving plant or soil material

"Natamycin antifungal eye drops were commenced when corneal scraping confirmed Fusarium species in the agricultural worker with a corneal ulcer."

"optic neuritis"

Inflammation of the optic nerve causing acute unilateral visual loss, pain on eye movement, and a relative afferent pupillary defect; a common presenting feature of multiple sclerosis

"The 28-year-old presented with painful visual loss and washed-out colour vision, and optic neuritis was confirmed by MRI showing gadolinium enhancement of the optic nerve."

"papilloedema"

Bilateral swelling of the optic disc caused by raised intracranial pressure; a critical sign requiring urgent neuroimaging to exclude space-occupying lesions or idiopathic intracranial hypertension

"Grade three papilloedema was identified on fundoscopy in the obese young woman with daily headaches, leading to a diagnosis of idiopathic intracranial hypertension."

"relative afferent pupillary defect"

An abnormal pupillary response detected with the swinging flashlight test, indicating asymmetric optic nerve or retinal disease that reduces the afferent signal from one eye

"A relative afferent pupillary defect in the left eye confirmed significant asymmetry in optic nerve function, supporting the diagnosis of left optic neuritis."

"homonymous hemianopia"

A visual field defect affecting the same side of both visual fields — for example, loss of the right half of vision in both eyes — caused by damage to the optic tract, radiation, or visual cortex

"CT of the head confirmed a left occipital lobe infarct as the cause of the patient's right homonymous hemianopia, discovered when he failed to see traffic on his right side."

"nystagmus"

An involuntary, rhythmic oscillation of the eyes that can be congenital or acquired; acquired nystagmus requires investigation for cerebellar, brainstem, or vestibular pathology

"Downbeat nystagmus on primary gaze pointed to a lesion at the cervicomedullary junction, prompting urgent MRI of the posterior fossa."

"third nerve palsy"

Paralysis of the oculomotor nerve causing ptosis, a fixed dilated pupil, and the eye positioned down and out due to loss of innervation to most extraocular muscles

"A posterior communicating artery aneurysm was excluded by CT angiography in the patient presenting with a painful third nerve palsy with pupil involvement."

"visual evoked potential"

An electrophysiological test that measures the electrical signal generated by the visual cortex in response to a pattern stimulus, used to detect delayed or absent optic nerve conduction

"Prolonged latency on visual evoked potential testing provided objective evidence of previous subclinical optic neuritis in the patient being investigated for multiple sclerosis."

"internuclear ophthalmoplegia"

A gaze disorder caused by a lesion in the medial longitudinal fasciculus, resulting in impaired adduction of the ipsilateral eye and nystagmus in the contralateral abducting eye during horizontal gaze

"Bilateral internuclear ophthalmoplegia is a highly specific sign of multiple sclerosis and was identified during the ocular motility examination in this patient."