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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
How to treat refractive errors of the eyes?
Refractive error refers to the condition where, without accommodation, parallel light rays passing through the refractive media of the eye do not form a clear image on the retina, but rather form an image in front of or behind the retina. This includes hyperopia (farsightedness), myopia (nearsightedness), and astigmatism. For myopia treatment, light to moderate myopia can be corrected with appropriate concave lenses; in cases of hyperopia, if vision is normal and there are no subjective symptoms, no treatment is needed. However, if there are symptoms of visual fatigue, appropriate convex lenses should be used for correction; astigmatism requires the correction with cylindrical lenses.
Trachoma has several treatment methods.
Trachoma is a chronic infectious conjunctival and corneal inflammation caused by Chlamydia trachomatis infection and is one of the leading causes of blindness. Around three hundred to six hundred million people worldwide are infected with trachoma. Treatment includes systemic and local ocular medication, as well as treatment for complications. Local treatments include 0.1% rifampicin eye drops, 0.1% tetrahydropalmatine eye drops, or 0.5% neomycin eye drops. Erythromycin or tetracycline eye ointments are used at night, with a treatment duration of at least ten to twelve weeks. Acute or severe cases of trachoma should be treated with systemic antibiotics. Surgical correction of trichiasis and entropion is crucial to prevent late-stage trachoma scarring that leads to blindness.
Can I drink alcohol with conjunctivitis?
Conjunctivitis is one of the most common diseases in clinical ophthalmology, often caused by inflammation or viral infections. Taking anti-inflammatory drugs and alternately using ribavirin eye drops and ofloxacin eye drops for treatment yields relatively good results. Avoid staying up late, rubbing eyes with hands, and consuming spicy and other irritating foods. Abstain from smoking and drinking alcohol. Smoking and drinking during treatment can exacerbate the condition and lead to recurrent episodes.
Can conjunctivitis be contagious?
Hyperacute bacterial conjunctivitis, acute or subacute bacterial conjunctivitis is highly contagious and requires isolation to prevent spread and epidemics. When one eye is infected, measures should be taken to prevent infection of the other eye. Strict attention should be paid to personal and communal hygiene, advocating frequent hand and face washing, and avoiding wiping eyes with hands or sleeves. Strict disinfection of face washing utensils, towels, and medical instruments used by the patient is also necessary.
What is the difference between refractive error and nearsightedness?
Myopia is a type of refractive error, which refers to the condition where, when the eye is not adjusting, parallel light rays after passing through the refractive action of the eye, do not form a clear image on the retina, but rather image in front of or behind the retina. This includes hyperopia, myopia, and astigmatism. When parallel light rays image in front of the retina after passing through the eye's refractive action, it is called myopia.
The main cause of myopia formation
Myopia is primarily caused by the focusing system of the eyeball focusing parallel light rays in front of the retina when our eyes are in a relaxed adjustment state. The far point of a myopic eye is at a certain point in front of the eye. The occurrence of myopia is influenced by a combination of factors including genetics and environment, and the incidence is still being explored. Based on the refractive components, myopia can be classified into refractive myopia and axial myopia. According to the degree of myopia, it can be classified into mild myopia (below 300 degrees), moderate myopia (300 to 600 degrees), and high myopia (above 600 degrees). The clinical manifestations of myopia include blurry distance vision but good near vision, often with fluctuating distance vision where squinting is needed to see clearly at a distance.
Cataracts are a condition of the eye.
Cataracts are degenerative changes causing a decline in optical quality, which are due to the decreased transparency or color change of a structure in the eye called the lens. The pathogenesis of cataracts is quite complex, resulting from the long-term combined effects of various internal and external factors on the lens. The lens is situated in the fluid environment of the eye, and any factor impacting this environment, such as aging, genetics, metabolic abnormalities, trauma, radiation, poisoning, localized nutritional disorders, as well as certain systemic metabolic or immune diseases, can directly or indirectly damage the tissue structure of the lens, interfere with its normal metabolism, and cause the lens to become opaque.
What department should I go to for cataracts?
The department for cataract consultations is ophthalmology. Various factors such as aging, genetics, local nutritional disorders, immune and metabolic abnormalities, trauma, poisoning, radiation, etc., can cause metabolic disturbances in the lens, leading to the denaturation of lens proteins and resulting in opacity, known as cataracts. At this time, light is obstructed by the cloudy lens and cannot be projected onto the retina, causing blurred vision. This condition is commonly seen in individuals over forty years old, and the incidence increases with age. The disease can also be divided into congenital cataracts and acquired cataracts.
What are the symptoms of a glaucoma attack?
Typical acute angle-closure glaucoma has several different clinical stages, divided into the preclinical stage, prodromal stage, acute attack stage, intermittent stage, chronic stage, and absolute stage. The acute attack stage is mainly characterized by severe headache, eye pain, photophobia, tearing, and significant deterioration of vision, often reduced to counting fingers or hand motion, and may be accompanied by systemic symptoms such as nausea and vomiting. Physical signs include eyelid edema, mixed congestion, corneal epithelial edema, and the appearance of small droplets under the slit lamp. Patients may complain of rainbow vision, which primarily occurs due to the large number of small vesicles in the swollen corneal epithelium and the spaces between epithelial cells.
The main symptoms of cataracts
The main symptoms of cataracts include: First, a decline in vision, which is the most obvious and significant symptom of cataracts. Second, a decrease in contrast sensitivity, particularly noticeable at high spatial frequencies in cataract patients. Third, changes in refractive power. Nuclear cataracts lead to increased lens power due to an increase in the lens and refractive index, causing nuclear myopia. Fourth, monocular diplopia or polyopia due to uneven refractive power across different parts of the lens, similar to the effect of a prism, resulting in monocular diplopia or polyopia. Fifth, glare. Sixth, changes in color perception. Seventh, varying degrees of visual field defects.