# lens

/ˈɫɛnz/ (US)

Source: https://englishreference.com/word/lens
Updated: 2026-06-19

## Senses

### 1. optical glass

noun · CEFR B2

a curved piece of glass or plastic used in glasses, cameras, or telescopes to make things look clearer or larger.

For teachers: a transparent optical device, typically made of glass or plastic, that focuses or disperses light through refraction.

- He cleaned his camera lens carefully before taking a photo of the mountains.
- The optometrist determined that a stronger corrective lens was necessary to compensate for the patient's worsening astigmatism.

### 2. part of the eye

noun · CEFR C1 · Technical

the clear part inside your eye that helps you focus on what you are looking at.

For teachers: the transparent, biconvex structure behind the iris that changes shape to focus light onto the retina.

- As people get older, the lens in the eye can become less flexible.
- Cataract surgery involves the removal of the clouded natural lens and the insertion of a clear artificial substitute.

### 3. a way of looking at something

noun · CEFR C1 · Academic

a particular way of seeing or thinking about a situation.

For teachers: a figurative perspective or conceptual framework through which a subject is analysed or perceived.

- We should look at this problem through the lens of social justice.
- The historian examined the industrial revolution through the lens of environmental impact rather than purely economic growth.

### 4. computing

noun · CEFR C2 · Technical

a tool in some computer languages used to look at or change data inside a complex structure.

For teachers: a functional programming construct used to access and update nested data structures in a composable way.

- The developer used a lens to update the user's address deep inside the database object.
- By using lenses, the programmer could modify deeply nested state properties without manually destructuring the entire immutable object tree.

### 5. to film

verb · CEFR C2 · Technical

to record or shoot a movie.

For teachers: to film or photograph a motion picture or scene.

- The director decided to lens the entire movie in black and white.
- The production was lensed on location in Iceland to take advantage of the unique natural light and dramatic landscapes.

## Examples

- I need to clean the lens of my camera before taking pictures.
- The optometrist explained that a thicker lens would be necessary to correct my worsening nearsightedness.
- By examining the historical event through a sociological lens, the researchers were able to identify patterns of behavior that previous political analyses had overlooked.

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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.