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.
Answer: A vitreous detachment is the separation of the vitreous (or gel) that fills the back of the eye from the retina. Symptoms of a vitreous detachment include flashes and floaters. The biggest concern when a vitreous detachment occurs is the risk of developing a retinal tear that can lead to a retinal detachment. It is important to see an ophthalmologist if you develop the signs of a vitreous detachment to be sure you do not have a torn retina. Often the most bothersome part of a vitreous detachment, the floaters, will improve with time. It can take 3-6 months for them to improve.