Nystagmus I Eye condition information and support | RNIB

Macular hole - information, causes and treatment | RNIB | RNIB

Corneal transplant I Eye condition information | RNIB

Optic neuritis - information, causes and treatment | RNIB | RNIB

Privacy Policy - information and further details | RNIB | RNIB

Thyroid eye disease - causes and treatments | RNIB | RNIB

Find information on eye conditions a-z | RNIB | RNIB

We can't find that page | RNIB

Your eyes - find information on sight and conditions | RNIB

Coats disease I Eye condition information | RNIB

All `id` attributes on a page must be unique, or accessible technologies used by the page 
can stop working.

## Example

The duplicate `id` here makes it unclear which label belongs to which input field:

```html
<label for="name">Your name</label>
<input id="name">

<label for="name">Company name</label>
<input id="name">
```

As a result, accessible technologies like screen readers can fail to read out the 
correct text, or may read out no text at all.

Similar issues can occur when using `aria-labelledby` and `aria-describedby`.

## How to fix

Ensure all `id` attributes on a page are unique. 

## More information

See [Technique H93](https://www.w3.org/TR/2016/NOTE-WCAG20-TECHS-20161007/H93) 
for more information.

duplicate-id

December 2025

November 2025

RNIB

Title / URL	Issues
Nystagmus I Eye condition information and support \| RNIBwww.rnib.org.uk/your-eyes/eye-conditions-az/nystagmus/	4
Macular hole - information, causes and treatment \| RNIB \| RNIBwww.rnib.org.uk/your-eyes/eye-conditions-az/macular-hole/	2
Corneal transplant I Eye condition information \| RNIBwww.rnib.org.uk/your-eyes/eye-conditions-az/corneal-transplant/	2
Optic neuritis - information, causes and treatment \| RNIB \| RNIBwww.rnib.org.uk/your-eyes/eye-conditions-az/optic-neuritis/	2
Privacy Policy - information and further details \| RNIB \| RNIBwww.rnib.org.uk/privacy-policy/	2
Thyroid eye disease - causes and treatments \| RNIB \| RNIBwww.rnib.org.uk/your-eyes/eye-conditions-az/thyroid-eye-disease/	2
Find information on eye conditions a-z \| RNIB \| RNIBwww.rnib.org.uk/your-eyes/eye-conditions-az/	2
We can't find that page \| RNIBwww.rnib.org.uk/invented-url-for-404-page/	2
Your eyes - find information on sight and conditions \| RNIBwww.rnib.org.uk/your-eyes/	2
Coats disease I Eye condition information \| RNIBwww.rnib.org.uk/your-eyes/eye-conditions-az/coats-disease/	2

Fix duplicate IDs

RNIB

Where this issue has occurred