General terms:
* Blind: Complete or near-complete inability to see.
* Visually impaired: A general term encompassing all degrees of vision loss, from mild to complete blindness.
* Partially sighted: Having some degree of vision but not being able to see clearly enough to perform everyday tasks without assistance.
* Nearsighted: Difficulty seeing objects at a distance (also known as myopia).
* Farsighted: Difficulty seeing objects close up (also known as hyperopia).
More specific terms:
* Blurry: Having a hazy or indistinct vision.
* Dim: Having difficulty seeing in low light conditions.
* Fuzzy: Having a hazy or unclear vision.
* Double vision: Seeing two images of the same object.
* Astigmatism: Having an uneven curvature in the eye that distorts vision.
* Presbyopia: Age-related loss of near vision.
The best word to use will depend on the context and the specific type of vision impairment you are describing.