Clouding of the lens is known as cataract. The main symptoms are vision loss and blurred vision. Cataracts can be broadly divided into congenital and acquired cataracts according to the time of onset, among which acquired cataracts are the most common, and aged cataracts are the most common.
Early cataracts are mostly asymptomatic, and only a slight clouding of the lens can be found during eye examination. As the disease progresses, the main symptom of cataract is visual impairment, and the elderly may show painless and progressive vision loss; some patients complain of blurred vision, foggy eyes, photophobia, dark or yellow objects, and even monocular diplopia or hyperopia (double vision) and object distortion; some patients may have myopia, astigmatism or deepening of original myopia, and the elderly may find Presbyopia may be reduced in the elderly. Lens clouding can be found during eye examinations.
The most common type of age-related cataract is cortical cataract, which is characterized by early onset and slow vision loss; nuclear cataract has a later onset, and its effect on vision is not very obvious and does not progress quickly; posterior subcapsular cataract has an early onset, and its effect on vision is also obvious, and its condition develops quickly. Infants and children do not have the above-mentioned symptoms of complaints due to their young age, and they are mostly seen with abnormalities such as low vision, strabismus and nystagmus.
In summary, early cataracts are mostly asymptomatic, and symptoms such as vision loss and blurred vision may appear as the disease progresses.