In what way can corneal abrasions lead to blindness?

Unlikely. Corneal abrasions are a loss of the surface skin of the cornea, usually just a small portion. Healing usually is rapid and complete. Rarely there can be scarring, and if it is central can affect focusing. If neglected, infection is possible which might lead to vision loss. Abrasions are extremely common, and vision changes afterwards are very rare.

Related Questions

Can corneal abrasions lead to blindness?

Rarely. Very rarely do corneal abrasions lead to a permanent loss of vision - this is usually from a subsequent infection that is not treated quickly. Usually, abrasions heal with either no vision loss or very mild vision changes. Read more...
Corneal abrasion. It is rare for corneal abrasions to lead to blindness. If the abrasion becomes infected and is not treated properly it could lead to scarring of the cornea and a decrease in vision. Read more...