This is called a Dendritic Ulcer AKA Herpes Simplex Virus Keratitis.
It’s caused by,” the herpes simplex virus, a double stranded DNA virus made up of an icosahedral shaped capsid surrounding a core of DNA and phosphorite one of viral chromatin.” - @ophthalmologycase
The way you notice this virus is little branches that creep across the cornea.
It’s pretty crazy!
Original credits go to @ophthalmologycase