What is the meaning of V?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Visual impairment is a reduced level of vision that cannot be fully corrected with standard measures such as glasses or contact lenses. It ranges from mild vision loss to complete blindness and can affect one or both eyes. Causes vary widely, including refractive errors, cataracts, glaucoma, macular degeneration, diabetic retinopathy, and eye injuries.

Because vision changes can signal serious underlying conditions, identifying the cause early is critical to protecting your eyesight. If you're noticing changes in your vision, don't wait to find out what's behind them. Take a free, instant, online symptom check to better understand your symptoms and confidently navigate your next steps.

Reviewed for medical accuracy: 07/14/2026

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Explanation

Visual impairment is when someone has trouble seeing clearly, and this difficulty isn't completely fixed by wearing glasses, contacts, or even with surgery. It covers a broad range of problems—from slightly blurry vision to significant loss of sight.

When a person has visual impairment, everyday activities such as reading, driving, or recognizing faces might become hard. If you're experiencing unusual changes in your vision or other concerning symptoms, you can check your symptoms with Ubie's free AI-powered tool to better understand what might be affecting your sight. Conditions like cataracts, age-related macular degeneration, or uncorrected refractive error can all lead to visual impairment.

The Global Burden of Disease Study, for example, tracks causes and trends in vision loss to help improve care and prevent avoidable blindness. Overall, visual impairment affects how well people function in daily life, and efforts to prevent and treat it are important for helping people maintain their independence and quality of life.

(References)

GBD 2019 Blindness and Vision Impairment Collaborators; Vision Loss Expert Group of the Global Burden of Disease Study. Causes of blindness and vision impairment in 2020 and trends over 30 years, and prevalence of avoidable blindness in relation to VISION 2020: the Right to Sight: an analysis for the Global Burden of Disease Study. Lancet Glob Health. 2021 Feb;9(2):e144-e160. doi: 10.1016/S2214-109X(20)30489-7. Epub 2020 Dec 1. Erratum in: Lancet Glob Health. 2021 Apr;9(4):e408. doi: 10.1016/S2214-109X(21)00050-4. PMID: 33275949; PMCID: PMC7820391.
Keel S, Cieza A. Rising to the challenge: estimates of the magnitude and causes of vision impairment and blindness. Lancet Glob Health. 2021 Feb;9(2):e100-e101. doi: 10.1016/S2214-109X(21)00008-5. PMID: 33482137; PMCID: PMC7816084.
Chung, Susana T. L.∗; Advances in vision impairment research. Optometry and Vision Science 101(6):p 287-289, June 2024. | DOI: 10.1097/OPX.0000000000002163

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