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 On average, mitigation by a professional can cost anywhere from $650 to $1,900. 2  One of the most common methods or ridding a home of radon is by installing a radon mitigation system; this keeps a constant reading as well as reduces the radon in the air. 3  A system can cost upwards of $650 to $2,100.