Views:93 Author:Site Editor Publish Time: 2020-01-27 Origin:Site
Cataract is a common ophthalmic disease in the elderly, which is mainly caused by vision loss and blurred vision. Because of the environment, heredity, radiation and so on, the lens protein denaturation, affects the light entering the eye to reach the retina. How do you know if you have cataract?
Cataract patients often have discomfort such as vision loss, and the following are the most common cases:
1. Blurred Vision
Cataracts are mainly caused by lens turbidity. Patients first show blurred vision due to lens turbidity. Congenital cataracts are mainly manifested by poor vision that cannot be corrected.
At first, Patients will find that there was a fixed shadow in front of them, which could not be erased. With the increase of blurred vision, the shadow is not obvious, but the vision is obviously decreased.
The patient finds that the original presbyopia becomes shallow or does not need to bring presbyopia. This is due to crystalline sclerosis of crystalline myopia.
4. Monocular Multiple Vision
It is caused by irregular astigmatism of lens. Especially when the patients are relatively in dark places and the pupils are relatively dilated, such as at night when looking at the street lamp or seeing the moon.
5. Poor Vision in Outdoor Sunlight and Relatively Dark Indoors
This is common in nuclear cataracts. Due to the pupils shrink under strong light, vision is blocked.
When you find one or more of the above symptoms, you may have cataracts and should go to the hospital. You can go to the hospital for the following checks:
1. Vision Examination
The vision examination is actually a central vision check, that is, to understand the foveal fovea and its corresponding system functions. Because the lens is an important refractive medium second only to the cornea, lens changes will directly affect the quality and quantity of retinal imaging. Because of the development of surgical techniques and instruments in modern ophthalmology, the results of clinical vision examination are often used as an important reference for lens surgery. For example, from the perspective of prevention and treatment, the World Health Organization considers that lens opacification and corrected vision below 0.5 should be included in the scope of cataract diagnosis.
2. Mydriatic Examination
The lens is located behind the iris, and only the central part of the lens is exposed in the pupil area. Therefore, it cannot understand the whole picture of the lens through the small pupil, so mydriatic examination must be carried out. For the elderly with glaucoma tendency, the intraocular pressure should be measured before and after mydriatic and corresponding treatment should be done.
3. Oblique Illumination Method
Focus the flashlight on the lens at a 45-degree angle and observe on the front side whether the lens has turbidity. Through the projection width of the iris and the peripheral surface of the lens, it can be known whether the gap between the peripheral surface of the lens and the iris is widened, thereby determining whether there is a subluxation of the lens. Iris tremor can be seen in patients with aphakic eyes and a larger range of dislocations. When the lens is obviously turbid to opaque, the wide and narrow projection of the oblique iris on the lens surface indicates the degree of the lens anterior cortex turbidity.
4. Clear Illumination Method
The direct ophthalmoscope is about 10cm away from the cornea, and the diopter is placed at + 8D ~ + 10D. Normally, the pupil has a red uniform reflection. If the lens is cloudy, the red light background has dark shadow and its shape is consistent with that of the lens. Lens sclerosis and cloudiness can be distinguished by the method of clear illumination. When the lens is dislocated, a crescent-shaped shadow can be seen and even the fundus can be seen.
The earlier the cataract is treated, the better. So if you feel like you may have cataracts, remember to have a test as soon as possible.