refraction defect due to irregularities of the surface of the cornea or lens
Keratoconus Keratoconus (KC) is a disorder of the eye which results in progressive thinning of the cornea.[3] This may result in blurry vision, double vision, nearsightedness, astigmatism, and light sensitivity.[3] Usually both eyes are affected.[3] In more severe cases a scarring or a circle may be seen within the cornea.[4]
Ciliary body The ciliary body is a part of the eye that includes the ciliary muscle, which controls the shape of the lens, and the ciliary epithelium, which produces the aqueous humor. The vitreous humor is produced in the non-pigmented portion of the ciliary body.[1] The ciliary body is part of the uvea, the layer of tissue that delivers oxygen and nutrients to the eye tissues.  The ciliary body joins the ora serrata of the choroid to the root of the iris.[2]