Normal vision enables a person to see objects without distortion and without unexplained symptoms that deviate from the norm. To make certain the person still has normal vision, a doctor will recommend tests. These tests can lead to prescribed medications, glasses and contact lenses that can help correct the person's vision. As people age and health problems occur, they may develop problems with their vision.
Partial Blindness
The person may develop partial blindness or blind spots, even temporarily, that can indicate vision problems. The vision may return but the person may then have problems seeing objects to one side. Problems with vision at night may occur as well as a reduction in the sharpness in vision. Halos around lights indicate problems with vision, according to the New York Times Health Guide. These symptoms, which may indicate serious vision problems such as glaucoma, need medical intervention. The person may lose partial or full vision if these problems remain untreated.
Eye Movement Difficulties
Difficulty in eye movement occurs when problems arise in the cranial nerves that affect the nerves surrounding the eye. The eye may appear to move incorrectly and the person's perception of depth may distort. The person may have difficulty determining visual distance, such as the depth of steps on a stairway. This cranial nerve palsy occurs in types of head trauma and diabetes, AllAboutVision.com reports. This eye problem will not get better without treatment.
Blurred Vision
Blurred vision and tearing may occur as a result of a foreign object in the eye. Pain and a reddened eye may develop as well as frequent blinking. The eye may produce a discharge. Sensitivity to light will occur as well. The person will have difficulty seeing out of the affected eye. Permanent vision loss may occur as a result, states AllAboutVision.com. The foreign object will need to be removed from the eye.
Crossing of the Eyes
Strabismus, a crossing of the eyes, occurs because of weakness in the muscles of the eyes. Amblyopia usually classifies as the underlying problem. Visual difficulty, such as blurred vision and vision loss, occur. The person will have difficulty seeing correctly as his central vision deteriorates, according to AllAboutVision.com. The person with crossed eyes will need surgery to correct the vision. The doctor can prescribe a patch over the lazy eye if only one eye has the problem.
