<s>[INST] <<SYS>> This is a medical question of type : frequency <</SYS>> How many people are affected by lattice corneal dystrophy type I ? [/INST] Lattice corneal dystrophy type I is one of the most common disorders in a group of conditions that are characterized by protein deposits in the cornea (corneal dystrophies); however, it is still a rare condition. The prevalence of lattice corneal dystrophy type I is unknown. </s>