Definition
noun, plural: floaters
(ophthalmology) One or more spots or threadlike specks that seem to float or move in one’s visual field caused by a shadow cast on the retina by vitreous debris; muscae volitantes
(general) One that floats
Supplement
A floater, in general, pertains to the one that floats. In ophthalmology, a floater refers to the one or more spots or threadlike specks in the visual field. These floaters in front of one’s vision seem to move and float (thus, the name). These floaters are due to the shadow cast on the retina by vitreous debris. The vitreous humor is the clear fluid within the eyeball. It fills the chamber between the lens and the retina. It is gel-like and comprised of water, salts, sugars, vitrosin, and proteins. Cells may also be present in the vitreous humor. Phagocytes are one of them. Phagocytes are immune cells capable of phagocytosis. They “eat up” cellular debris to clear the visual field. Another group of cells is the hyalocytes, which produce hyaluronic acid and collagen.
The vitreous humor is transparent when young. However, flaws gradually develop as one ages. The gel in the vitreous humor is not replenished continuously and as such becomes stagnant. Consequently, cells and other substances could be deposited in it as floaters. The perception of these floaters is referred to as myodesopsia. These floaters that look like floating spots or threads in the visual field are caused by the shadows casted by vitreous debris.
See also:
Dictionary > Floater
You will also like...
Still Water Community Plants
This tutorial looks at the adaptations of freshwater plants for them to thrive in still water habitats. Familiarize your..
Ecological Research: Measuring & Analysis
This lesson is about the methods used for ecological research, such as quadrat and transect sampling, canopy fogging, an..
Takahē (Porphyrio hochstetteri)
Meet the colorful takahē, an extremely rare flightless bird. Find out more about its unique features and why they matte..
Abiotic Factors – Water Conditions
A still body of water may be disturbed by a variety of factors. One of them is wind. In fact, it is considered as the pr..
Examples of Natural Selection
Darwin's Finches are an example of natural selection in action. They are an excellent example of the way species' gene p..
Biosecurity and Biocontrol
This lesson explores the impact of biosecurity threats, and why they need to be identified and managed. Examples to incl..