00:00 / 00:00
Conductive hearing loss
Eustachian tube dysfunction
Tympanic membrane perforation
Age-related macular degeneration
Retinopathy of prematurity
Temporomandibular joint dysfunction
Gastroesophageal reflux disease (GERD)
Retropharyngeal and peritonsillar abscesses
Thyroglossal duct cyst
Acoustic neuroma (schwannoma)
Eye conditions: Inflammation, infections and trauma: Pathology review
Eye conditions: Refractive errors, lens disorders and glaucoma: Pathology review
Eye conditions: Retinal disorders: Pathology review
Nasal, oral and pharyngeal diseases: Pathology review
Parathyroid disorders and calcium imbalance: Pathology review
Thyroid nodules and thyroid cancer: Pathology review
Vertigo: Pathology review
0 / 13 complete
0 / 5 complete
Primary Angle-Closure Glaucoma (PACG - Acute)
Primary Open-Angle Glaucoma (POAG - Chronic)
glaucoma treatment p. 569
glaucoma p. 570
pilocarpine for p. 239
glaucoma and p. 553
glaucoma p. 553
acetazolamide for p. 628
atropine p. 240
β -blockers for p. 245
carbachol for p. 239
diabetes mellitus and p. 350
diagnosing p. 239
drugs for p. 569
epinephrine for p. 241
Sturge-Weber syndrome p. 541
Glaucoma is actually a group of eye diseases that are usually due to intraocular hypertension, or increased pressure in the eye, which damages the optic nerve and if left untreated can lead to blindness.
Taking a closer look at this cross section of the eye, you can see that it’s split up into different chambers: The anterior chamber includes the area from the cornea to the iris, the posterior chamber is this really narrow space between the iris and the lens.
And then this larger vitreous chamber includes the space between the lens and the back of the eye.
Not to be too confusing, but both the anterior and posterior chambers are located in the anterior segment of the eye, while the vitreous chamber is part of the posterior segment of the eye.
Typically all of the chambers in the eye are filled with fluid.
The chambers in the anterior section are filled with a liquid called aqueous humor, and the posterior section is filled with vitreous humor.
The aqueous humor is a transparent, watery fluid that is secreted by the ciliary epithelium, which in addition to secreting aqueous humor and providing nutrients to the lens and cornea, it provides structural support and helps to keep the shape of the eye.
So that fluid’s secreted into the posterior chamber, and then flows through a narrow space between the front of the lens and the back of the iris through the pupil to the anterior chamber.
From there the fluid flows out of the eye through the trabecular meshwork, which is a spongy tissue that acts like a drain, and this allows the fluid to go down into a circular channel called the canal of Schlemm and finally into aqueous veins that are part of the episcleral venous system—the veins around the sclera of the eye.
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