You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Shield ulcer is seen in - and explain in detail?
Impoant signs of spring catarrh Conjunctival Corneal Palpebral Bulbar $? Papillary hyperophy into polygonal $? Gelatinous thickening around $? Punctate epithelial keratitis papilla limbus $? Ulcerative vernal kratitis : shallow $? Giant papilla (Cauliflower $? Ducky red triangular congestion $? Pseudogerontoson : Characterized by a classical "cupid's bow" outline. excrescence) Ref: Parson's 22nd/e p.180-181 & 21st/e p.178; Khurana 7th/e p.81 & 4th/e p.74,75