corneal senile ring
Introduction
Introduction of corneal old ring The corneal senile ring is a lipidoid in the matrix around the corner. Found in the elderly, the incidence of both eyes. Initially turbid above the cornea, gradually developed into a ring. The ring is white, usually about 1 mm wide, with a clear outer border and a slightly blurred inner border, separated from the limbus by a clear corneal strip. The senile ring is usually a genetically predisposed, but sometimes it may be hyperlipoproteinemia (especially low-density lipoprotein) or elevated serum cholesterol. For example, intravenous injection of miconazole 10-30mg / (kg · d), divided into 3 doses, each dose generally does not exceed 600mg, each infusion time is 30-60min. An intravenous infusion of 0.2% fluconazole 100 mg can also be used. basic knowledge The proportion of illness: 0.01% (elderly) Susceptible people: seen in the elderly Mode of infection: non-infectious Complications: corneal ulcer
Cause
Corneal senile ring cause
Reduced resistance (30%):
For example, after contact with a contact lens or a corneal surgery, pathogenic fungi can invade the cornea, as these fungi can also be isolated from the conjunctival sac of 3%-28% of healthy people.
Immune dysfunction (30%):
It is related to the pathogenesis of some strains, such as Candida, Penicillium and Yeast. Broad-spectrum antibiotics, glucocorticoids or immunosuppressive agents are used systemically or locally for a long time.
Prevention
Corneal senile ring prevention
1. Develop good hygiene habits, wash your hands frequently, and often cut your nails.
2, do not wear contact lenses for a long time; be careful when replacing contact lenses.
3, the same as the prevention of acute conjunctivitis, mainly to cut off the source of infection and attention to eye and hand hygiene.
4. It is forbidden for patients to bathe and swim in public places.
5, the treatment is mainly based on topical medication, drug oral administration and acupuncture also have a certain effect.
6, eat more foods and fruits with cold and heat and diarrhea, such as white, melon, bitter gourd, fresh sorghum, sugar cane, banana, watermelon, etc.
Complication
Corneal senile ring complications Complications corneal ulcer
May be complicated by corneal perforation, corneal ulcer.
Symptom
Corneal senile ring symptoms common symptoms visual impairment corneal ulcer ciliary congestion corneal color film ring
Slow onset, less irritating symptoms, with visual impairment. The corneal infiltrating foci is white or gray, dense, and the surface is opaque. It has a toothpaste-like or greasy-like appearance. There is a shallow groove formed by collagen dissolution around the ulcer, or an immune ring formed by antigen-antibody reaction. Sometimes a pseudopod or satellite-like invasive foci can be seen next to the corneal lesion, and there may be plaque fibroids after the lesion. The anterior chamber is empyema, grayish white, viscous or mushy. The fungus is highly penetrating, and it is easy to cause fungal endophthalmitis when entering the anterior chamber or the cornea is worn.
Examine
Corneal senile ring examination
Laboratory tests to find fungi and hyphae can be diagnosed. Common methods include corneal scraping Gram and Giemsa staining, 10%-20% potassium hydroxide wet blade scraping and culture are negative, and clinically highly suspected, may be considered for corneal biopsy. In addition, immunofluorescence staining, electron microscopy and PCR techniques are also used for the diagnosis of the fungal corneal senile ring. Corneal confocal microscopy as a non-invasive test, can directly detect fungal pathogens in the lesion
Diagnosis
Diagnosis and diagnosis of corneal senile ring
According to the history of corneal plant injury, combined with the characteristics of corneal lesions, a preliminary diagnosis can be made. Laboratory tests to find fungi and hyphae can be diagnosed.
Corneal ulcers are inconsistent due to different pathogenic species. The early ulcer is shallow, the surface layer is a little nodular infiltration, grayish white or milky white turbid; irregular shape, rough surface, dry and sexy, and clear boundary with healthy cornea. Necrotic tissue is non-sticky and easy to remove. Deep-type ulcers, in addition to the symptoms of heavier symptoms, appear like "clinical corneal ulcers", the ulcer surface is flat and rough, "tongue" or "toothpaste", rising from the corneal surface. Shallow grooves can sometimes occur at the border of the ulcer. When the ulcer develops deep, the necrotic tissue falls off, the cornea is perforated, or the phenomenon of "dew" appears, and it can be speculated that the anterior chamber has disappeared. Sometimes in the necrotic cornea, there is an iris tissue, indicating that the ulcer has been perforated.
