What is disc haemorrhage?
Disc hemorrhages are characteristic linear hemorrhages perpendicular to the optic disc, most commonly on the superotemporal or inferotemporal margin. The cause of disc hemorrhages has not been fully characterized, and mechanical and vascular hypotheses with evidence supporting both have been proposed.
What are the DISC signs of glaucoma?
Characteristics of a glaucomatous ONH
- generalised/focal enlargement of the cup.
- disc haemorrhage (within 1 disc diameter of ONH)
- thinning of neuroretinal rim (usually at superior & inferior poles)
- asymmetry of cupping between patient’s eyes.
- loss of nerve fibre layer.
Is an eye hemorrhage serious?
Most eye bleeding is harmless and caused by a small broken blood vessel in the outer part of the eye. The cause of eye bleeding isn’t always known. Eye bleeding in the pupil and iris, known as hyphema, is rare but may be more serious.
What does retinal hemorrhage look like?
SYMPTOMS OF RETINAL HEMORRHAGE If you have a retinal hemorrhage, you might experience painless floaters, cobwebs, haze or shadows in one or both eyes, vision loss, red tint to vision or brief flashes of light in the peripheral vision.
What is the normal optic disc?
Optic disc surface area is between 2.1 mm2 and about 2.8 mm2 (the mean value of 2.69 mm2) with a range from 0.80 mm2 to 5.54 mm2 in an average Caucasian population without high myopia. Optic disc size varies from small to large according to racial heritage as follows: Caucasians, Hispanics, Asians, African-Americans.
Are there disc hemorrhages in eyes with glaucoma?
DH is often associated with notching and structural change in the optic disc rim, focal defects of the RNFL, progressive defects of the visual field (VF), and beta zone peripapillary atrophy (βPPA). DHs are rarely found in normal eyes, but they are detected in approximately 4 to 7 percent of eyes with glaucoma.
How is NTG related to optic disc hemorrhages?
On ophthalmoscopy, patients with NTG tend to have more localized defects of the retinal nerve fiber layer and an increased propensity for optic disc hemorrhages compared with patients with POAG. Several studies have found a link between the presence of disc hemorrhages and NTG.
What do you need to know about normal tension glaucoma?
Normal Tension Glaucoma 1 Summary. Normal tension glaucoma (NTG) is a common form of primary open angle glaucoma (POAG) in which there is no measured elevation of the intraocular pressure (IOP). 2 Disease Entity. Normal pressure glaucoma, an open angle glaucoma. 3 Diagnosis. 4 Management.
Which is the most common type of disc hemorrhage?
Normal tension glaucoma has the highest incidence of disc hemorrhage, followed by PACG and POAG, which have similar incidence. The clinical characteristics of hemorrhage are not different among 3 types of glaucoma.