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.
The Average Cost for Radon Mitigation. The first step in radon mitigation is testing for the presence of the gas. There are different types of radon tests. Only a licensed radon tester can perform such a test, and a homeowner can expect to pay around $200.The average cost of testing and installation of a radon mitigation system is $758, explains the Home Advisor website. Most homeowners spent between $644 and $872 for radon testing and mitigation of the gas.here are different types of radon tests. Only a licensed radon tester can perform such a test, and a homeowner can expect to pay around $200. The average cost of testing and installation of a radon mitigation system is $758, explains the Home Advisor website.