Optometry & Visual Performance 194 Volume 14 | Issue 2 | June 2026 Retinal Vascular Disease Coats’ Disease Idiopathic retinal telangiectasia and capillary leakage with massive exudation (non-hereditary, sporadic) Unilateral telangiectatic vessels with yellow-white lipid exudates in the peripheral retina; predominantly affects boys; often presents with strabismus, leukocoria, or xanthocoria; fluorescein angiography shows characteristic leakage; can mimic unilateral amblyopia Optic Nerve Anomalies Optic Atrophy Genetic (dominant, recessive, or X-linked) or acquired damage to retinal ganglion cells and optic nerve axons Pale optic discs (temporal or diffuse); nystagmus in recessive forms; vision loss often bilateral and symmetric; may have associated systemic neurologic findings Leber’s Hereditary Optic Neuropathy Mitochondrial DNA point mutations causing acute dysfunction of retinal ganglion cells Sequential or simultaneous central/cecocentral scotomas; typically presents in young males (teens to 30s); disc hyperemia or pseudoedema acutely, followed by atrophy; maternal inheritance pattern Optic Nerve Hypoplasia Incomplete intrauterine development of retinal ganglion cell axons (idiopathic or associated with septo-optic dysplasia, maternal diabetes, alcohol/drug exposure) Small or pale optic disc with “double-ring” sign; vision loss often out of proportion to amblyogenic factor; may be unilateral or bilateral; endocrine dysfunction common (growth hormone deficiency, hypothyroidism); neuroimaging (MRI) and endocrine evaluation recommended Morning Glory Disc Anomaly Congenital excavated optic disc malformation with central glial tuft and peripapillary retinal detachment risk Enlarged, funnel-shaped excavated disc with central glial tissue and radial retinal folds; high risk of serous retinal detachment or choroidal neovascularization; usually unilateral; vision often severely reduced Neoplasms of the Visual Pathway Optic pathway glioma or craniopharyngioma Benign or malignant tumors compressing or infiltrating the optic nerve, chiasm, or tracts Slowly progressive vision loss (often asymmetric); disc pallor or swelling; endocrine abnormalities (craniopharyngioma); bitemporal field defects; MRI with contrast is essential for diagnosis Cerebral / Cortical Visual Impairment Cerebral Visual Impairment (CVI) Damage to visual cortex, optic radiations, or higher visual association areas from perinatal brain injury (hypoxic-ischemic encephalopathy, periventricular leukomalacia, prematurity, hemorrhage, infection, or seizures) Often bilateral or asymmetric; poor visual attention, dorsal-stream dysfunction (visuospatial/motion deficits), better vision in familiar environments; history of neurological insult or MRI abnormalities; normal ocular structures; vision loss disproportionate to any amblyogenic factor; frequently abnormal VEP Other Masqueraders Persistent Fetal Vasculature (PFV) Failure of the fetal hyaloid vascular system to regress during embryonic development Remnants of hyaloid artery/vitreous vessels causing media opacity, cataract, or retinal traction; typically unilateral; microphthalmia or elongated ciliary processes common; leukocoria or strabismus at presentation • In deep anisometropia (e.g., plano/+8.00), you may need several follow-up visits to titrate the BBP gradually. • Re-evaluate the BBP every 4–6 weeks initially, as it can change as binocular function improves. • Contact lenses or Shaw lens can sometimes give an even better binocular response than spectacles (less aniseikonia and prism imbalance). Masqueraders of Amblyopia: Any condition that reduces vision without obvious external signs can mimic amblyopia. Dilated fundus examination is mandatory in every case; atypical features should trigger prompt escalation. Although a significant relative afferent pupillary defect (RAPD) typically signals organic pathology, research indicates that a dense functional amblyopia (20/400 or worse) can occasionally produce a very subtle RAPD. This phenomenon is a frequent point of confusion for clinicians attempting to differentiate functional neurodevelopmental deficits from structural organic loss. In the majority of amblyopia cases, an APD does not occur, because the condition is fundamentally a neurodevelopmental disorder of the visual cortex rather than a disease of the eye or afferent visual pathway traveling from the eye to the brain. Because the retina and optic nerve remain structurally normal, the subcortical pupillary light reflex—which branches off the visual pathway before reaching V1—is typically unaffected. In exceptionally severe, dense cases, a slight APD may manifest due to a significant reduction
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