Sudden blurring of the eyes, which later returns, is usually due to elevated intraocular pressure (IOP) or transient ocular ischemia.
Elevated intraocular pressure (IOP) is a common cause of transient blurred vision. Elevated IOP causes corneal edema, which reduces the transparency of the cornea, resulting in blurred vision, which is then restored as the IOP is lowered and the cornea becomes transparent again.
Transient ischemia is caused by the spasm of blood vessels such as the ophthalmic artery or the central retinal artery. When the blood supply to the eye is insufficient, it will definitely affect the function of the eye, resulting in blurred vision, and as the spasm of the blood vessels returns to normal, the vision will improve again on its own.
Once a patient experiences transient blurred vision, it is recommended that he or she go to the ophthalmology department of the hospital in a timely manner to find the cause of the problem and get prompt treatment to avoid further aggravation of his or her condition.