Keratoconus (KC) is a disorder of the eye which results in progressive thinning of the cornea. This may result in blurry vision, double vision, nearsightedness, astigmatism, and light sensitivity. Usually both eyes are affected. In more severe cases a scarring or a circle may be seen within the cornea.
On the plus side Hardie Board is primarily made of concrete. It is a fibrous concrete board that termites don't eat. This is good news for warmer climates where termites stay active most of the year. Hardie siding is also impervious to moisture. You can put it in a pail of water and leave it for as long as you like and it will not become saturated.
There are both benefits and considerations offered by brick as well as Hardiplank siding. Hardiplank siding is fiber cement, a composite material made of sand, cement and cellulose fibers. Some of the biggest selling points with both types of siding are that they are durable and require only slight maintenance throughout the years.