From the Irish Times
Apart from the major conditions such as glaucoma and cataracts, there are a number of diseases or accidents that can affect vision and potentially lead to blindness. Priscilla Lynch reports:

Diabetic Retinopathy
Diabetic retinopathy is a potentially sight-threatening complication that affects people with both type 1 and type 2 diabetes, it affects the small blood vessels in the retina, at the back of the eye, causing them to leak or become blocked.

Underlying Systemic Diseases
Autoimmune diseases, Sjögren’s syndrome, Multiple sclerosis (MS), can all cause a myriad of eye diseases.

Sexually Transmitted Infections
Certain sexually transmitted infections (STIs) can also cause eye problems.

Retinal Detachment
Retinal detachment is a rare but very serious eye complication that requires immediate treatment to prevent permanent vision loss or blindness.

Rosacea
Rosacea is a skin condition that causes facial redness and flushing and it can also cause dry eye, eye and eyelid redness, soreness, and light sensitivity.

Trauma
Household accidents, sporting injuries and assaults can cause serious eye and eye-socket trauma leading to vision loss or blindness.

Acquired Brain Injury
People commonly believe that visual ability is simply linked to the eyes, but they are just part of the complex visual pathway.

Pediatric Eye Conditions
The most common eye conditions in children are vision deficiencies that require correction with glasses, or strabismus, a visual problem in which the eyes are not aligned properly and point in different directions. This affects about one in 20 children and usually develops before a child is five.

For more detailed descriptions, read more here.

Lynch, Pricilla. “A Look at Less Visible Eye Conditions.” The Irish Times. 15 Apr. 2015. Web. 6 Jan. 2016. .