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Glaucoma
Early symptoms of glaucoma
There are many types of glaucoma, and the symptoms vary between different types. Some patients with glaucoma might not have noticeable symptoms in the early stages; others may only experience mild eye soreness and occasional blurred vision, which can improve with rest; some present with insidious vision decline and field defects. Glaucoma refers to a group of progressive optic nerve damage that eventually impairs vision, mainly associated with pathological elevation of intraocular pressure. Glaucoma is the second leading cause of blindness worldwide, and it is the top irreversible blinding eye disease. Common symptoms of glaucoma include blurry vision, vision decline, field defects, and acute attacks, often accompanied by eye pain, headache, nausea, vomiting, and more. If glaucoma symptoms occur, or there is a suspicion of glaucoma, it is advised to visit an ophthalmology clinic for comprehensive examinations like visual acuity, intraocular pressure, fundus examinations, etc., to determine the cause and provide targeted treatment, actively reduce intraocular pressure, and protect the optic nerve.
Glaucoma open angle vs closed angle differences
Primary glaucoma is clinically divided into two major categories: angle-closure glaucoma and open-angle glaucoma. The difference between them is that angle-closure glaucoma is due to a pre-existing abnormal configuration of the iris, leading to a mechanical blockage of the anterior chamber angle by peripheral iris tissue, which obstructs the outflow of aqueous humor, thus causing an increase in intraocular pressure. In contrast, open-angle glaucoma has a normal appearance of the anterior chamber angle, which remains open, and its increase in intraocular pressure is due to a pathology in the trabecular meshwork’s aqueous humor outflow system, increasing the resistance to aqueous outflow. Currently, the ratio of primary angle-closure glaucoma to primary open-angle glaucoma is about 3:1, making it the most common type of glaucoma in China.
Is high intraocular pressure always glaucoma?
Glaucoma is a group of eye diseases characterized by typical optic nerve atrophy and visual field defects, with high intraocular pressure and visual field loss as features. Clinically, some patients have long-term high intraocular pressure but do not exhibit optic nerve and visual field damage. This condition is not called glaucoma, but is referred to as ocular hypertension. Meanwhile, some patients may have normal eye pressure but still exhibit typical glaucoma optic nerve damage and visual field defects; this condition is called normal-tension glaucoma. Therefore, high intraocular pressure does not necessarily indicate glaucoma, and normal intraocular pressure can also potentially be glaucoma.
What are the symptoms of glaucoma precursor?
The prodromal phase of glaucoma is characterized by transient or recurrent attacks, often occurring multiple times, typically in the evenings. During an attack, patients suddenly experience blurred vision and halos around lights, possibly accompanied by pain in the forehead on the affected side or a sour swelling at the root of the nose on the same side. These symptoms are short-lived and can resolve or disappear after rest. If examined immediately, increased intraocular pressure can be detected, often above 40 mmHg, with slight conjunctival congestion or no congestion. There is mild foggy edema in the corneal epithelium. The anterior chamber is extremely shallow, but the aqueous humor is clear, with a wide closure of the chamber angle, slightly dilated pupils, and sluggish light reflexes. After a minor attack subsides, aside from the characteristic shallow anterior chamber, there generally is no permanent tissue damage.
What are the symptoms of glaucoma?
Glaucoma refers to a group of eye diseases characterized by increased eye pressure, leading to optic nerve atrophy and vision loss. The symptoms of glaucoma are mainly caused by increased eye pressure, resulting in eye pain. In cases of acute angle-closure glaucoma, symptoms include eye pain along with nausea, vomiting, photophobia, and tearing, which can easily be mistaken for neurological diseases. Chronic glaucoma symptoms, such as headache, nausea, and vomiting, are less pronounced, and eye discomfort is also more concealed during attacks, making early detection difficult. Therefore, it is important for glaucoma patients to undergo early examination and diagnosis, and to receive appropriate treatment in order to protect the optic nerve and prevent severe vision loss.
How to rule out glaucoma with high eye pressure?
Normal intraocular pressure ranges from 10-21mmHg. If it exceeds 21mmHg, it is considered to be increased intraocular pressure. Main symptoms of high intraocular pressure include eye distension, eye pain, tearing, photophobia, blurred vision, nausea, vomiting, headache, etc. High intraocular pressure is a primary diagnostic criterion for glaucoma, but it is not the only standard. Glaucoma can be divided into primary glaucoma, secondary glaucoma, congenital glaucoma, and mixed glaucoma. Primary glaucoma can further be subdivided into open-angle glaucoma and angle-closure glaucoma. Only during an acute attack of angle-closure glaucoma does the intraocular pressure increase, whereas open-angle glaucoma generally does not affect intraocular pressure. Therefore, the diagnosis of glaucoma mainly relies on a comprehensive assessment of the angle of the anterior chamber, intraocular pressure, visual field, visual acuity, and the condition of the optic disc.
Can glaucoma patients undergo myopia surgery?
Glaucoma is a group of eye diseases characterized by atrophy of the optic nerve and defects in the visual field. Common symptoms include reduced vision, eye pain, and loss of visual field. In terms of treatment, it primarily involves the use of medications to control eye pressure or anti-glaucoma surgery to manage eye pressure, which helps delay the atrophy of the optic nerve and the loss of vision. However, since glaucoma has already caused damage to the optic nerve, it is generally not recommended to undergo myopia surgery, as it cannot improve vision.
The difference between open-angle and closed-angle glaucoma
Primary angle-closure glaucoma is a type of glaucoma caused by the peripheral iris blocking the trabecular meshwork, or permanently adhering to the trabecular meshwork, obstructing the outflow of aqueous humor, leading to increased intraocular pressure. It is characterized by a narrow angle and the anatomical feature of the peripheral iris being prone to contact with the trabecular meshwork. Gonioscopy confirming angle closure is an important diagnostic criterion. The characteristic of open-angle glaucoma, however, is that even though intraocular pressure is elevated, the angle remains open, with the obstruction of aqueous outflow occurring at the trabecular meshwork system.
What is glaucoma?
Glaucoma is one of the main blinding eye diseases in ophthalmology, with a certain genetic predisposition, affecting 10 to 15 percent of direct relatives of patients. Intraocular pressure is the pressure exerted by the contents within the eyeball against its inner wall. Glaucoma is a group of diseases characterized by distinctive optic nerve atrophy and visual field defects, and pathologically increased intraocular pressure is one of the main risk factors for glaucoma. The level of increased intraocular pressure and the tolerance of the optic nerve to pressure damage are primarily related to the occurrence and progression of glaucomatous optic nerve atrophy and visual field defects.
What are the symptoms of glaucoma?
Glaucoma is a group of eye diseases characterized by characteristic optic nerve atrophy and visual field defects, with pathological elevated intraocular pressure as its main risk factor. The main symptoms of glaucoma include blurry vision and blocked vision. Due to different types, it is also accompanied by other eye symptoms such as eye pain, eye bulging, foggy vision, as well as pain in the nasal root and head, and even nausea and vomiting.