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.
The best eye doctor for you should be: 1  Recommended by your doctor, friends, or family. 2  Appropriate to your vision problems; if you need routine eyeglass/contact lens care, you have many choices. If you have a specific medical eye condition, you may want to choose an ophthalmologist. 3  Someone you like and trust.