If the patient’s eyes are congested and there is a foggy sensation when looking at things, it is recommended to immediately go to the ophthalmology clinic for examination, because in this case it is considered that the patient’s eyes are diseased. Clinically, after the development of keratitis, the patient will not be able to see clearly due to the appearance of ulcerated foci in the cornea, and at this time the eyes will also be congested. There is also a possibility of iritis, after the patient has iritis the eyes will have ciliary congestion, and due to the presence of a large number of cells in the anterior chamber, vision will be affected at this time, and some patients will have a change of seeing things like fog. There is also a possibility that the patient has glaucoma, glaucoma is a common eye disease in ophthalmology clinic, after glaucoma, the eyes will have a feeling of swelling and pain, at this time, the examination will find that the eyes are congested, and due to the elevation of intraocular pressure, vision will decrease, corneal edema will lead to see things like a fog.