Poi Sensei｜Ophthalmology Explained Simply and Visually

Poi Sensei's Eye Dojo

Header banner: line drawings of an eyeball cross-section and a fundus with an ERG trace on an indigo background

Ophthalmology, explained simply and visually.

Peripheral Corneal Thinning: an eye with an inferior crescent of corneal thinning and a slit-beam inset

Corneal and Conjunctival Diseases

Peripheral Corneal Thinning: Pellucid, Terrien and Mooren

October 15, 2026 Poi Sensei

Bietti crystalline dystrophy: fundus with fine glittering crystals over the posterior pole and a near-infrared inset

Retinal Diseases

Bietti Crystalline Dystrophy: Crystals, Autofluorescence, ERG and How to Tell It From RP

October 14, 2026 Poi Sensei

Stargardt Disease: Flecks, FAF and Dark Choroid. Illustrated fundus with macular atrophy and yellow flecks, and an autofluorescence inset

Macular Diseases

Stargardt Disease: Flecks, Autofluorescence, the Dark Choroid and ERG Groups

October 14, 2026 Poi Sensei

Fundus albipunctatus vs retinitis punctata albescens: a fundus with uniform white dots sparing the macula

Retinal Diseases

Fundus Albipunctatus vs Retinitis Punctata Albescens: How to Tell Them Apart

October 12, 2026 Poi Sensei

Corneal dystrophies: tell them apart by layer. A slit-lamp style photograph of granular corneal dystrophy with a magnified inset, and icons for depth, shape and two questions

Corneal and Conjunctival Diseases

Corneal Dystrophies: How to Tell Them Apart by Layer

October 11, 2026 Poi Sensei

Reading anisocoria: which pupil is abnormal, and what to do next. A line drawing of two eyes, one with a small pupil and one with a larger pupil, each with a yellow measuring bracket, with icons for light versus dark, ptosis and an eye drop

Neuro-ophthalmology

Anisocoria: How to Tell Which Pupil Is Abnormal, and What to Do Next

October 6, 2026 Poi Sensei

Optic neuritis: AQP4, MOG and what the ONTT really showed. A line drawing of an eyeball with the optic nerve behind it highlighted in yellow, with icons for pain on eye movement, a swollen optic disc and an antibody

Neuro-ophthalmology

Optic Neuritis: Typical Features, AQP4 and MOG Antibodies, and What the ONTT Really Showed

September 26, 2026 Poi Sensei

Intorsion vs extorsion: which muscles roll the eye, and how to see torsion. A line drawing of an eyeball rolling around its visual axis, with icons for the 12 o'clock mark, the fundus and the double Maddox rod

Neuro-ophthalmology

Intorsion vs Extorsion: Which Muscles Roll the Eye, and How to See Torsion in Your Patient

September 25, 2026 Poi Sensei

Bielschowsky head tilt test: the eyes counter-roll when the head tilts, and in superior oblique palsy the affected eye goes up

Neuro-ophthalmology

Bielschowsky Head Tilt Test: Why the Eye Goes Up, and How to Read It

September 17, 2026 Poi Sensei