What eye diseases can cause blindness? There are a number of eye diseases and conditions that can lead to blindness if left untreated. This underscores the importance of early detection, regular eye exams, and accurate diagnosis for ongoing vision and eye health.
Almost all cases of blindness are caused by disease; only about 4 percent are due to eye injury or other trauma. Just over one million people in the U.S. are legally blind. The legal definition of blindness refers to vision that has deteriorated to 20/200 or worse.
The Components of Optimal Vision
There are numerous factors that contribute to optimal eye and vision function. It is a complex process involving the refraction of light by the cornea and iris. The image is projected onto the back wall of the eye, where millions of nerve endings in the retina process and perceive it. This information is then sent to the brain via the optic nerve for translation.
Vision loss and blindness can result when any of these components is affected or disrupted. Eye disease can cause deterioration, cloudy vision, or a change in the eye’s shape that distorts vision.
Damaging Eye Conditions That Can Lead to Blindness
Macular Degeneration
Macular degeneration is the most common cause of vision loss and blindness in older individuals. This condition involves the gradual deterioration of the retinal nerve endings. As described above, the retina is crucial to vision, forming an image at the back of the eye and contributing to sharpness in the central visual field. Macular degeneration begins with small blind spots and blurred vision. While there is no cure, there are treatments that can help to slow its progression.
Glaucoma
Glaucoma involves a buildup of pressure in the eye due to fluid accumulation. The pressure eventually damages the retina and optic nerve, causing a loss of peripheral vision. This condition is often undiagnosed and undetected, which is highly problematic since glaucoma cannot be reversed. However, proactive treatments, including eye drops and surgical procedures, can slow its progression and help to avoid blindness.
Cataracts
Cataracts are cloudy growths on the surface of the eye’s lens. They can cause blurred vision, glare, and the fading of color vision. This condition affects many older individuals and often requires surgery to be resolved.
Diabetic Retinopathy
Diabetic retinopathy is caused by systemic damage from diabetes. The blood vessels that supply the retina become damaged, leading to bleeding and eventual blindness.
Traumatic Injury
Injury to the eye or optic nerve, whether caused by abrasive chemicals or physical contact with the eye.
Other Causes of Blindness
Blindness can also be caused by certain infectious diseases, such as Herpes simplex virus type 1 (HSV-1), infectious and inflammatory eye diseases, a vitamin A deficiency, an eye stroke (retinal artery occlusion), retinal vein occlusions, abnormal blood vessel development in the retinas of premature babies (retinopathy of prematurity), cancers of the eye, and congenital or hereditary diseases.
Regular Eye Exams Can Help Prevent Blindness
Blindness is almost always caused by a progressive eye disease, not an eye injury. Because of this, regular eye exams are crucial to early detection. For the best results, see your eye doctor at least once per year. Schedule your comprehensive eye exam today to protect your vision.