All Eyes Aren't Created Equal - Review of Optometry
2014年6月15日 · Crescents may change over time with globe elongation or other pathologies that cause retinal stretching. 13 Choroidal crescent pigment may mimic acquired peripapillary atrophy secondary to an optic neuropathy.
The clinical description of PPA should be distinguished from the physiological grey crescent that surrounds the optic nerve. The grey crescent represents a localized deposition of pigmentation demarcating the edge of the optic disc. 7
Peripapillary Atrophy - CorneaCare
2022年12月2日 · Peripapillary atrophy may either be white, yellow, or black in color, depending on the type. There are different types of peripapillary atrophy, including choroidal crescent, RPE crescent, and scleral crescent. It is more likely to happen in eyes with a high nearsighted prescription (such as -7.00).
Keep Peripapillary Atrophy on Watch - Review of Optometry
2002年5月15日 · PPA refers to the atrophic-like changes that occur to the retina and choroid immediately adjacent to the optic nerve. Generally, there are two types, based on location and appearance: Zone beta is usually located closest to the nerve. Loss of the underlying RPE and choroid in a visible scleral crescent characterizes this form of PPA.
The relationship between peripapillary crescent and axial length ...
We evaluated the relationship between the size of the peripapillary crescent and the axial length (AL) of the eye as well as the fine structure of the peripapillary crescent in selected eyes.
GLAUCOMA SPECIALIST BLOG: "THE GLOG"
2019年3月10日 · The clinical description of PPA should be distinguished from the physiological grey crescent that surrounds the optic nerve. The grey crescent represents a localized deposition of pigmentation demarcating the edge of the optic disc.
Abnormalities of the Optic Nerve in Down Syndrome and …
A scleral crescent is visible at the temporal margin (between the black arrows). The disc is oval and bean-shaped in this case, with a hyperpigmented halo. An extensive area of peripapillary atrophy, with visible choroidal vessels, is evident (white arrows).
Controversies in the association of parapapillary atrophy with …
Nevarez et al. have compared peripapillary scleral and choroidal crescents between the two eyes in patients with unilateral glaucoma. They found that in most cases, the three tissue layers (RPE, choroid, and sclera) encircling the ONH in glaucomatous as well as nonglaucomatous eyes superimposed exactly on each other without any difference ...
In this long-term longitudinal study, we examined the frequency and magnitude of pro-gression of peripapillary atrophy in eyes with progressive and nonprogressive glaucomatous optic nerve damage.
Pearls for Correct Assessment of Optic Disc at Glaucoma Diagnosis
2017年11月1日 · PPA differs from normal peripapillary choroidal crescents with high myopia and the inferior scleral crescent in eyes with tilted optic discs in the respect that PPA is typically irregular and patchy, whereas choroidal crescent is typically very uniform in color and shape.