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.
How Do I Choose a Doctor? Should you choose an optometrist (OD) or an ophthalmologist (MD) for your initial eye exam? If this is a routine checkup, you can go with either one. If you have or think you might have an eye problem like cataracts or glaucoma, or a health condition like diabetes, choose an ophthalmologist.