A Ptery­gium (pro­nounced TER-RIG-E-YUM) is an el­e­vat­ed, wing-like, fleshy, tri­an­gu­lar growth that de­vel­ops on the white of the eye (scle­ra) and can in­vade the cornea (the clear front cov­er­ing of the eye). Ptery­gium is usu­al­ly a harm­less con­di­tion and is a be­nign (non-can­cer­ous) growth. If it grows across the cornea, it may cause dis­com­fort and blur­ry vi­sion.