Adeel Ur Rehman on Instagram: "Can’t Look Up? Think Parinaud Syndrome | Dorsal Midbrain Lesion Light–near dissociation, convergence-retraction nystagmus, eyelid retraction (Collier’s sign), and impaired upgaze point toward Parinaud syndrome. This classic dorsal midbrain (pretectal) lesion is most commonly caused by pineal region tumors, but can also result from multiple sclerosis, hydrocephalus (setting-sun sign), or midbrain stroke. A high-yield clinical and imaging diagnosis—especially for exa

@theeyecareoptom on Instagram: "Light enters the eye and strikes the retina, where rods and cones convert it into electrical impulses. These signals pass through bipolar cells to retinal ganglion cells. The axons of the ganglion cells converge at the optic disc, an area without photoreceptors, creating the physiological blind spot. From here, the axons leave the eye as the optic nerve (cranial nerve II) and pass through the optic canal into the cranial cavity. The two optic nerves meet at the op

Area in Math | Definition, Formula & Calculation

Lateral Surface Area: Definition & Formula

Visual pathway

Optic nerve

Posterior column - Medial lemniscus pathway