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.
Fluid in the vitreous can pull the tear further and pull off the retina. A retinal detachment is a medical emergency because it often will progress quickly and affect much of the vision. Rapid diagnosis will allow one of the following treatments: 1  Argon laser photocoagulation of the tear. 2  Cryo treatment of a larger tear. 3  Intraocular administration of an air or gas bubble to blow the retina back into position so that the above treatments can be administered.