An example of one of these devices is a column chromatography bed, meaning that the stationary bed is in a tube. In some situations, chromatography is used as a method of purification. This is referred to as preparative chromatography. Another use of chromatography is analytical chromatography. This method of separation occurs with smaller amounts of material and is used to measure analytes in a mixture.
Flashing lights and floaters may be the initial symptoms of a retinal detachment or of a retinal tear that precedes the detachment itself. Anyone who is beginning to experience these symptoms should see an eye doctor (ophthalmologist) for a retinal exam.
Retinal detachment can progress quickly. Because retinal detachment affects side (peripheral) vision first, you may not notice the vision loss right away. If not treated, detachment can spread to the center of the retina (macula) and damage central vision. Retinal detachment requires urgent care. Without treatment, vision loss from retinal detachment can progress from minor to severe or even to blindness within a few hours or days. Retinal tears and holes, though, may not need treatment. The retina sometimes develops small, round holes as it ages, and many of them will not lead to retinal detachment.