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Zheng Xin
Ophthalmology
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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.
Does floaters need surgery?
The commonly mentioned "floaters" in ophthalmology refer to the turbidity in the vitreous body of the eyes. In most cases, this phenomenon is normal; it is a normal physiological degenerative change of the vitreal body and generally does not have much impact on vision. In such cases, surgery is not needed. However, if there is a pathological change in the eye, such as bleeding at the base of the eye, and blood flows into the vitreous body, causing turbidity, surgery can be considered if this severely affects vision.
What lenses should be used for nearsightedness?
Myopia, or nearsightedness, refers to a refractive condition where, in a relaxed state of accommodation, parallel light rays are focused in front of the retina after passing through the eye's refractive system. Myopia is categorized by degree into mild myopia, which is less than or equal to 300 degrees, moderate myopia ranging from 325 to 600 degrees, and high myopia, which is over 600 degrees. Generally, the degree of myopia is within 600 degrees, and most patients do not exhibit any pathological changes in the fundus. They require the use of suitable concave lenses for correction. If the degree of myopia exceeds 600 degrees, a fundus examination is necessary. If there are no special changes in the fundus, correction can also be made using appropriate concave lenses.
Does nearsightedness surgery require hospitalization?
Myopia surgery does not require hospitalization; it is completed on an outpatient basis. Before the surgery, routine blood tests, screenings for infectious diseases, and specialized eye examinations are conducted. If the pre-operative examinations are thorough and there are no contraindications for surgery, the procedure can be performed on an outpatient basis. After the surgery, patients can go home and must return to the surgical hospital the next day for a follow-up examination. Post-operative medication should be used as prescribed by the surgeon, and regular follow-up appointments should be scheduled.
Can farsightedness and astigmatism be corrected with glasses?
Hyperopia is a condition where parallel rays of light entering the eye focus behind the retina, preventing external objects from forming a clear image on the retina. This condition is referred to as hyperopia. Astigmatism is due to the cornea of the eye having a certain curvature, with light bending unevenly across the cornea due to its irregular curvature, causing different refractive indices on each meridian of the cornea. This results in the light rays not focusing on the same focal point, thereby preventing the rays from accurately focusing on the retina to form a clear image. This condition is known as astigmatism. Both hyperopia and astigmatism are types of refractive errors, and wearing glasses can correct them. It is also necessary to wear glasses promptly for correction.
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.
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.
What to do with high eye pressure glaucoma?
Glaucoma is a group of eye diseases characterized by typical optic nerve atrophy and visual field defects. Its main features are high intraocular pressure and visual field damage. The treatment of glaucoma primarily focuses on controlling intraocular pressure, delaying damage to the optic nerve, and preserving remaining vision. Lowering intraocular pressure is essential for treating glaucoma, so it can be treated locally with medications that reduce intraocular pressure. If medications cannot control the pressure, surgery may be necessary to manage it. (Specific medications should be used under the guidance of a physician.)
Does nearsightedness surgery involve holding the eyelid open?
Eye surgery, apart from eyelid surgery, requires the use of a speculum to hold the eyelids open to fully expose the field of vision for surgeries involving the eyeball and the inside of the eye. Myopia surgery, which involves the surface of the eyeball, also necessitates holding the eyelids open. The surgery can then be performed with the aid of a laser.
The harms of trichiasis
Trichiasis refers to the condition where eyelashes grow backward and irritate the eyeball. There are many causes of trichiasis, including eye injuries such as burns which can lead to scar formation and subsequently scarring trichiasis. Other causes include blepharitis and meibomian gland dysfunction. The harm posed by trichiasis is significant; the misdirected growth of eyelashes towards the eyeball and their constant friction can lead to conjunctival congestion, corneal opacity, ingrowth of new blood vessels into the cornea, and potentially result in keratitis and corneal ulcers.