II. Symptoms
1. Seeing a spot or spots, other shapes
such as black or gray dots, squiggly lines, threadlike strands, ring
shaped, etc. before the eyes
2. Movement of the spots or shapes that parallels eye movement.
3. Etc.
A, Causes
There are many causes of floater, including
1. Eyes diseases
Eye diseases can cause damage to the eye of that can lead to muscae volitantes.
2. Vitreous cyst
Vitreous cyst is associated to the cause
of floater, although it is rare. The etiology has been theorized to be
both congenital and acquired.
Acquired cysts may be due to trauma or other forms of intraocular
inflammation. Pigmented cysts are believed to originate from the pars
ciliaris and nonpigmented cysts are likely to be derived from the
remnants of the hyaloidal artery system. The appearances of the cysts
are striking and are often seen as clear spherical bodies in the
vitreous with interesting interlacing surface patterns. The cysts are
benign and are of little significance, except when they encroach on the
visual axis and produce visual disturbances (usually floater symptoms)(1).
3. Vitreous syneresis
vitreous normally will undergo liquefaction and changed from
jellylike material to fluid like material in a process called syneresis
of vitreous and this will
cause the collage fibers within the vitreous to form strands. With each
eye movements, those strands will also move, causing eye floaters(2).
4. Posterior vitreous detachments (PVD)
Posterior vitreous detachments can cause uscae volitantes. It is
a condition of the eye in which the vitreous humor separates from the
retina due to aging as the condition is common in older adults and over
75% of those over the age of 65 develop it(3).
5. Retinal detachment
Retinal detachment associated to the
causes of floater, is a eye disorder in which the retina peels away from
its underlying layer of support tissue(4) and affected mostly in middle-aged or older population.
6. Hyaloid remnant
A rare condition in which there remain some parts of the hyaloid artery.
Posteriorly there may be a vascular loop or the thread of an
obliterated vessel running forward from the optic disc and floating
freely in the vitreous. Anteriorly there may be some fibrous remnants
attached to the posterior lens capsule and others sometimes floating in
the vitreous. The anterior attachment of the hyaloid artery to the lens
may also remain throughout life as a black dot, called Mittendorf's dot,
and can be seen within the pupil by direct ophthalmoscopy (it appears
as a white dot with the biomicroscope). There is rarely any visual
interference although patients may sometimes report seeing muscae
volitantes(5).
7. Other causes of Muscae volitantes
a. Patient with oily tears and
inpissated meibomian glands may also accumulate debris within the tear
layer, which can be reported as floaters.
b. Patients with ocular allergies may
also be prime candidates for this phenomenon, since the eye produces
excess mucus in order to soothe the eye from the allergic assault.
c. Vitreous haemorrhage. A PVD that
encounters an area of vitreoretinal adhesion can cause a tractional tear
in the retina. If a retinal blood vessel is involved, subsequent
leakage into the vitreous cavity and retrohyaloid space will occur.
d. A relatively common vitreous anomaly
that occasionally causes floaters is asteroid hyalosis. Asteroid bodies
are calcium soaps that attach to the vitreous framework(6).
8. Etc.
Chinese Secrets To Fatty Liver And Obesity Reversal
Use The Revolutionary Findings To Achieve
Optimal Health And Loose Weight
Super foods Library, Eat Yourself Healthy With The Best of the Best Nature Has to Offer
Back to General health http://kylejnorton.blogspot.ca/p/general-health.html
Back to Kyle J. Norton Home page http://kylejnorton.blogspot.ca
Sources
Sources
