Light from an object passes through the cornea which is a transparent dome like structure covering the iris. The light rays are refracted by the cornea onto the lens. The light rays are refracted a second time whilst passing through the lens and focussed onto the retina â the light sensitive part of the eye.
The average Radon mitigation cost in Portland, Oregon, or Vancouver, Washington is between $800 to $2,500 with an average of $1,200.
1 Installing a water radon mitigation system runs from $1,000-$4,500, and maintenance runs $0 to $150 annually. 2  To find out about radon content in a city water system, call the local water provider. 3  It's wise to retest a home's radon level every year or two after a mitigation system is installed.