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.
If not, he may decide to refer you to a rheumatologist -- a specialist in arthritis diseases. After consulting with your primary care doctor, it may be that your diagnosis is not clear cut. Or you may seem to have a complicated case. At that point, it may be wise to see a rheumatologist, requesting a referral.