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 A radon kit can cost anywhere from $13 to $30. 2  For example, the First Alert RD1 Radon Gas Test Kit costs $13 to $23. 3  Based on a 1-10 scale, anything under 4pCi/L is deemed âstandardâ according to the EPA.4  If that number surpasses 4, mitigation will be necessary to ensure that the radon is free from the home. 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.