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Peng Xi Feng
Ophthalmology
About me
Shenzhen Longgang Central Hospital, Ophthalmology Deputy Chief Physician.
Proficient in diseases
Familiar with the diagnosis of various common eye diseases such as cataracts, glaucoma, eye trauma, and ocular surface diseases, skilled in eye fluorescein angiography, electrophysiology, eye A/B ultrasound and other examinations.
Voices
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.
What are the treatment methods for cataracts?
For the treatment of cataracts, the curative method is surgery, as medications generally do not have a curative effect. For early-stage cataracts, medications can control the condition. However, for advanced cataracts, medications are essentially ineffective. Currently, there is no specific drug for treating cataracts, and surgery is the best option. The common surgical methods for cataract are: 1. Intracapsular cataract extraction; 2. Phacoemulsification; The modern technique of extracapsular cataract extraction combined with the implantation of an artificial lens has become the most widely used surgical method and is also a relatively mature technique.
Can trachoma wear colored contact lenses?
The eyes themselves already have trachoma, which is one of the contraindications for wearing contact lenses. Therefore, based on the current health condition of the eyes, it is not suitable to fit contact lenses. Since the eyes already have an infectious disease, wearing cosmetic contacts, which contact the cornea, can easily lead to the occurrence of keratitis and worsen the inflammation. It is necessary to visit a professional ophthalmologist for examination and treatment of the trachoma. After the treatment is completed, then consider the issue of fitting contact lenses.
Conjunctivitis and Keratitis Differences
Under normal circumstances, bacteria can reside in the conjunctival sac. Infection can occur when the pathogenicity of infecting bacteria is stronger than the host's defense capabilities, or when the host's defense capabilities are compromised. Patients with varying degrees of conjunctival hyperemia and purulent, mucoid, or mucopurulent secretions in the conjunctival sac should be suspected of bacterial conjunctivitis. Keratitis refers to the condition where the cornea's defense capabilities are reduced, and inflammation of the corneal tissue occurs due to external or endogenous pathogenic factors invading the cornea.
Can conjunctivitis heal on its own?
Conjunctivitis can be classified as hyperacute, acute or subacute, and chronic, based on the speed of onset. Based on the severity of the condition, it can be categorized as mild, moderate, or severe. Acute conjunctivitis is usually self-limiting, with a duration of about two weeks. After treatment with sensitive antibiotics, recovery can occur within a few days. Chronic conjunctivitis is not self-limiting and is more challenging to treat.
Trachoma is caused by what?
Trachoma is a type of conjunctival keratitis caused by the Chlamydia trachomatis bacterium. It is a chronic infectious disease characterized by a rough and uneven appearance on the surface of the conjunctiva, resembling sand grains, hence its name. In the early stages, the conjunctiva shows infiltration, such as growths of papillae and follicles, along with corneal vascular pannus. In late stages, due to scarring of the affected conjunctiva, entropion and trichiasis can occur, aggravating the damage to the cornea and severely impacting vision or even causing blindness in the patient.
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.
The difference between conjunctivitis and keratitis.
Conjunctivitis, also known as acute or subacute conjunctivitis, and keratitis are among the most common diseases of the ocular surface, but they are different. Firstly, the locations of the cornea and conjunctiva are different. The cornea is a transparent, avascular tissue through which light enters the eye, allowing people to see. The conjunctiva is divided into the bulbar conjunctiva and the palpebral conjunctiva. Inflammation occurring on the cornea is called keratitis, while inflammation on the conjunctiva is referred to as conjunctivitis. Symptoms of conjunctivitis include congestion, foreign body sensation, photophobia, and tearing, among others. The symptoms of keratitis include a significant foreign body sensation, distinct pain, often affecting vision, and accompanied by photophobia.
Can chronic keratitis cause blindness?
Chronic bacterial conjunctivitis generally does not cause blindness. Its main clinical symptoms include itching, burning, dryness, eye pain, and visual fatigue. The conjunctiva is mildly congested and may be accompanied by thickening of the palpebral conjunctiva, papillary hypertrophy, and mucous secretions. Moraxella can cause canthal conjunctivitis, which is accompanied by crusting and ulceration of the skin at the outer canthus, and hypertrophy of the palpebral conjunctiva's papillae and follicles. Staphylococcus aureus infections are often accompanied by ulcerative blepharitis, or peripheral corneal punctate infiltration.
Is refractive amblyopia easy to treat?
Early detection, treatment, and training for refractive amblyopia can potentially restore normal vision, but the extent of recovery varies from person to person. Since the principles behind various amblyopia treatment methods differ and have their advantages, comprehensive therapy is superior to single therapy. For a child with amblyopia in one eye, the routine initially involves covering the healthy eye to give the amblyopic eye more focused exercise, combined with precise visual acuity training, stimulation from amblyopia treatment devices, and so forth. After months or years of treatment, the child's vision in the amblyopic eye will show significant and rapid improvement.