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What check should be done for blurred vision?_industry news_

by:Eugenia     2022-03-10
Blurred vision is something that everyone often encounters. Some are related to eye discomfort caused by using the eyes for too long, some are related to eye diseases, and some are related to systemic diseases. Therefore, it is very useful to check for blurred vision. If necessary, let’s take a look at what checks should be done for blurred vision. One: Medical history of blurred vision 1. Ask in detail about the occurrence and development of blurred vision. Is the blurred vision in one eye or both eyes; whether it occurs simultaneously or sequentially; whether it occurs rapidly or gradually; is it poor far vision, poor near vision, or both near and far vision. Whether there are other symptoms, such as eye congestion, shame, tearing, pain, to rule out keratitis, iridocyclitis. 2. Physical examination of blurred vision Blurred vision may be caused by systemic diseases, so physical examination is very important. 2: Visual acuity 1. Visual acuity includes distance vision and near vision examination, which involves astigmatism, amblyopia, etc. Those over 40 years old are considered presbyopia. Both far and near vision are poor, such as hyperopia or astigmatism, or opacity of refractive interstitium, fundus or optic neuropathy, intracranial disease, etc. If there is ciliary hyperemia, keratitis, iridocyclitis, and glaucoma should be considered. Sudden blurred vision may be caused by central retinal artery occlusion and ischemic optic neuropathy. The visual acuity decreases rapidly within a few days, which may be caused by central retinal vein occlusion, retinal detachment, vitreous hemorrhage, eye and head trauma, poisoning, acute intracranial lesions, etc. No light perception may be optic nerve atrophy and eyeball atrophy. 2. Examination of the eyelid by the external eye. Generally, eyelid lesions rarely cause blurred vision. Blurred vision occurs only when the eyelid lesions cause irritation factors. Such as eyelids turning inside and out, trichiasis, conjunctival stones, blepharitis, epilepsy, etc. Orbit and eyeball Is the eyeball protruding or sunken? Is the eyeball position abnormal? Can the orbital circumference touch the mass? Is the eyeball rotation restricted? Whether the cornea has pannus, infiltration, ulcer, scar, degeneration, foreign body, deformity. Anterior chamber depth, degree of turbid aqueous humor, presence or absence of empyema, hemorrhage, and exudate. Iris color, texture, defects (congenital, surgical), nodules, atrophy, front and back adhesions, tremor. Pupil shape, size, edge, light response. Whether there are exudates, pigments, etc. in the pupil area. The presence, location and transparency of crystals. 3. Vitreous body and fundus examination Fundus examination is an important method to check the diseases of the vitreous body, retina, choroid and optic nerve. Ophthalmoscopes are required to check the fundus. At present, direct ophthalmoscopes are often used to observe the vitreous body for turbidity, bleeding, liquefaction, degeneration, foreign bodies, and parasites. 4. Special examination (1) Slit lamp microscopic examination is suitable for patients with eye diseases. Those who have a health checkup. (2) Visual field The visual field inspection method is divided into dynamic and static inspections. The moving visual target is used to measure the points of equal sensitivity. The connected line is called the isoline of sight, and the peripheral contour of the visual field is recorded. Static inspection is to measure the light sensitivity threshold value of each point on a meridian, and connect it into a curve to get the concept of depth of visual field defect. (3) Retinoscopy and audition. Observe the motion through the retinoscope, and use the lens to eliminate the motion, and finally find the position of the neutral point, so as to judge the nature and degree of the refractive error of the examinee. (4) Measurement of intraocular pressure and exophthalmos The measurement of intraocular pressure for glaucoma is essential. Three: Laboratory examination of blurred vision In order to clarify the diagnosis or investigate the cause, blood pressure, blood, urine routine, erythrocyte sedimentation rate, blood sugar, tuberculin test, thyroid function, pathological examination, etc. have important reference values. Four: Inspection of blurred vision equipment 1. Fundus Fluorescein angiography Fundus Fluorescein angiography is a kind of rapid injection of dyes that can produce fluorescence effect into blood vessels, and at the same time, the use of a fundus mirror or fundus camera with color filters for observation or photographing Inspection method. Can further understand the fine structure, dynamic changes and functional changes of fundus blood circulation (up to the level of capillaries), and provide more and more detailed diagnostic evidence for fundus diseases. 2. Visual electrophysiological examination Visual electrophysiological examination includes three parts: electrooculogram (EOG), electroretinogram (ERG) and visual evoked potential (VEP). It can be used for the diagnosis and follow-up of retinitis pigmentosa, vitamin deficiency, achromatic blindness, retinal detachment, yolk-like macular degeneration, drug-toxic retinopathy, retinal vascular disease and choroiditis; optic neuropathy, visual pathway disease, macula, etc. Visual electrophysiological examination is more suitable for patients who cannot be used for psychophysical examination, such as infants, mentally retarded or pseudo-blind persons; in addition, it can overcome the obstacle of opacity and detect visual Functions such as cataracts, vitreous opacity, and visual electrophysiological examination before retinal detachment can help predict the recovery of vision after surgery. 3. Imaging examinations include orbital X-ray examination, ultrasound exploration, CT scan, magnetic resonance imaging (MRI), etc. It can show the structure and pathological changes of the eye, and can achieve the purpose of direct inspection for the opaque tissue of the eye.
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