<prompt> Giant papillary conjunctivitis is caused byContact lensTrichiasisLASIKL.ASEK  <response>: Ans: A Contact lens Ref: Kanski clinical ophthalmology 6th edition; page 218, 234Explanation:Conjunctiva papillae: Hyperplasic conjunctival epithelium with fibrovascular core and subepithelial infiltration with inflammatory cells.Three types of papillae:Micropapillae - mosaic like red dotsMacropapillae - 1 mm in sizeGiant papillae - I mm in sizeCauses of Giant Papillary ConjunctivitisRepeated mechanical irritation of the conjunctivaOcular prosthesesExtruding scleral bucklesExposed ocular suturesFiltering blebElevated corneal scars- Giant papillary conjunctivitis symptoms and signs, such as papillary changes in the tarsal conjunctiva, have been associated with the use of all types of contact lenses eg. rigid, hydrogel, silicone hydrogel, piggyback, scleral, prosthetic.Incidence of giant papillary conjunctivitis with various types of contact lensesSoft contact lens wearers: 1 to 45Conventional soft contact lens: 34Extended wear disposable soft contact lens wearers -5Frequent replacement contact lens every one day to twelve weeks: 21.27Rigid gas permeable lens wearers: Very low 1 to 5. 