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Keratoconus is a non - inflammatory, progressive condition where the central or paracentral cornea undergoes progressive thinning and steepening causing irregular astigmatism and a ‘cone shaped’ cornea. ⁣


𝐄𝐱𝐭𝐞𝐫𝐧𝐚𝐥 𝐬𝐢𝐠𝐧𝐬 𝐨𝐟 𝐊𝐞𝐫𝐚𝐭𝐨𝐜𝐨𝐧𝐮𝐬 ⁣⁣


𝐌𝐮𝐧𝐬𝐨𝐧’𝐬 𝐒𝐢𝐠𝐧⁣⁣⁣

V shaped conformation of lower lid produced by the ectatic cornea in downgaze ⁣⁣⁣


𝐑𝐢𝐳𝐮𝐭𝐭𝐢’𝐬 𝐒𝐢𝐠𝐧⁣⁣⁣

Sharply focused beam of light near the nasal limbus produced by lateral illumination of the cornea ⁣⁣⁣


Other external signs : ⁣⁣⁣

Charleux sign: Dark reflex in centre of cornea with distant direct ophthalmoscope in dilated pupils ⁣⁣⁣


Scissoring reflex on retinoscopy ⁣⁣⁣


Image from Rajan Eye Care Hospital⁣⁣

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