# eyesight

/ˈaɪˌsaɪt/ (US) · /ˈaɪsaɪt/ (UK) · CEFR B1 · Noun

Source: https://englishreference.com/word/eyesight
Updated: 2026-05-07

## Definition

the ability to see. You use this word to talk about how well or how poorly your eyes work.

For teachers: the faculty or power of seeing; visual acuity. Refers to the physiological ability to perceive light and form.

## Examples

- She wears glasses because her eyesight is poor.
- Regular check-ups are essential to ensure your eyesight remains sharp as you get older.
- The pilot's exceptional eyesight allowed him to spot the landing strip through the dense fog long before the instruments confirmed their position.

## Pitfalls

- Not "He has a good eyesight" but "He has good eyesight" — Eyesight is uncountable and does not take the indefinite article 'a'.

## Usage notes

- Typically used with qualitative adjectives such as 'good', 'poor', 'failing', or 'diminishing'.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.