It is very bad for you to suffer the keratoconus which will be a serious eye disease which will make you get blinded. Keratoconus will also cause your light sensitivity. When you get the keratoconus, your cone thinning of the cornea is the central forward. An eye disease characterized it often cause highly irregular myopic astigmatism and different degrees of visual impairment, without inflammation. It is often happened among women around the age of youth. The early symptom is given priority to with refractive error, for myopia. Then it is gradually developed into astigmatism or irregular astigmatism, general lens can be corrected. The medium-term vision declines further, generally lens not correct. You must use contact lens vision correction and slit lamp examination to see the top of the central cornea gradually thinning, push out and so on. Sometimes after the elastic layer fracture, the aqueous humor intrusion, corneal stromal edema and opacity can occur. Later, the apex often forms irregular linear scar or muddy cornea. The corneal superficial have new blood vessels ingrowth, decreased vision height and contact lens vision correction.