Nibbler SEO audit for


The overall score for this website.


How accessible the website is to mobile and disabled users.


How satisfying the website is likely to be for users.


How well marketed and popular the website is.


How well designed and built the website is.

Nibbler tested a sample of 5 pages from this website at 6:32 AM on May 25, 2023 (BST).

Top priorities for website improvement

  • Consider the amount of text on this website and increase it if appropriate. (read more)
  • Add width and height attributes to all image tags. The width and height you specify should be the same as the source image. If you want to resize an image in the browser, use CSS. (read more)
  • To appear higher in search engine results, consider link building activity as a way to build your search ranking. Be careful though, because incoming links which are obviously artificial are likely to be detected by search engines and could have an adverse effect. (read more)

Amount of content8.1

Rendering Chart...

  • This website has an average of 344 words per page. The amount of content on a website has been shown to correlate with its search engine ranking.
    • Consider the amount of text on this website and increase it if appropriate.


32% of images have a clearly defined size

9 images are being resized by the browser


Mobile screenshot of www.nei.nih.govTablet screenshot of
  • All of this website appears to be optimised for viewing on a mobile phone or a tablet.

Media specific CSS detected

MediaMin widthMax widthCSS file

Server behavior10.0

Yes404 page


  • This website handles missing pages correctly by sending a 404 HTTP status code.
  • This website was served with GZIP encoding. This is very good because it reduces the loading time of a web page.
  • This website follows the best practice of using a permanent (HTTP 301) redirect between URLs with/without trailing slashes. This is ideal.
  • This website follows the best practice of using a permanent (HTTP 301) redirect from to This is ideal.


100% of pages use analytics

Google Tag Manager

  • Every page in this website is using Google Tag Manager. This is excellent and should allow for a complete analysis of visitor behavior.

Page titles10.0

100% of pages have defined titles

0% of page titles are weak

  • All pages were found to use page titles appropriately. Page titles appear in search results and at the top of the browser's window when visiting the site. Appropriate page titles are particularly important for search engine optimization.


advance artificial babies' browse bureau camera care census centers change chronic climate common conditions contact control data delivery department discover disease diseases drug employees espa explores eyes funding glaucoma health healthy help human impacts infographics information initiatives institute intelligence keep kids leader learn looking month more nation's news other policies popular potential premature prevention protect rehabilitation research saving services smartphone sources statistics system take things topics trivia used vision your

  • All pages were found to use defined headings. This is excellent as it allows visitors and search engines to summarize the content of webpages quickly. Correctly defined headings aid accessibility and are particularly important for search engine optimization.

Page headings detail

URLHeadingLevel Eye InstituteH1 nation's leader in vision research.H2 Eye Health TopicsH2 españolH2 is Healthy Vision Month!H2 Research NewsH2 used to advance drug delivery system for glaucoma and other chronic diseasesH2 explores potential impacts of climate change on eye healthH2 premature babies’ vision with a smartphone camera and artificial intelligenceH2 for Vision ResearchH2 Research InitiativesH2 NEIH2 NEI EmployeesH2 About Eye HealthH1 your eyes healthyH2 about eye conditions and diseasesH2 information about vision rehabilitation servicesH2 kids learn about eye healthH2 out our eye health campaignsH2 eye health in your communityH2 NEIH2 NEI EmployeesH2 VisionH1 your eyes healthyH2's in your eye? Take a look around!H2 a dilated eye examH2 an eye care professionalH2 free or low-cost eye careH2 our eye health trivia quiz!H2 8 things you can do to protect your visionH2 NEIH2 NEI EmployeesH2 Conditions and DiseasesH1 Eye ConditionsH2 Conditions and Diseases A to ZH2 for more sources of eye health information?H2 NEIH2 NEI EmployeesH2 Health Data and StatisticsH1 Department of Health and Human ServicesH2 for Disease Control and PreventionH2 Census BureauH2 our eye disease infographicsH2 NEIH2 NEI EmployeesH2

Meta tags10.0

This is how this website will look in Google search listings:

National Eye Institute | National Eye Institute

The National Eye Institute (NEI) performs and supports vision research and education programs that protect and prolong vision. Learn about eye conditions, healthy ...

  • All pages were found to include a meta description. This is good because search engines (like Google) show this text in search result pages.

Meta Tags (name attribute)

Page URLNameContent,lACaj571Gx_VdLF3HKSKUf1Wxx0H_bWxO3BYDZ_C1uw National Eye Institute (NEI) performs and supports vision research and education programs that protect and prolong vision. Learn about eye conditions, healthy eyes, vision studies, and grants for vision research., initial-scale=1.0,lACaj571Gx_VdLF3HKSKUf1Wxx0H_bWxO3BYDZ_C1uw how to take care of your eyes, get the facts about specific eye problems, and help others learn about healthy vision., initial-scale=1.0 14, 2023, 3:57:52 PM,lACaj571Gx_VdLF3HKSKUf1Wxx0H_bWxO3BYDZ_C1uw eye diseases don’t have any warning signs — so you could have an eye problem and not know it. Read about what you can do to keep your eyes healthy, including getting a dilated eye exam, finding an eye doctor, and getting help paying for care, initial-scale=1.0 17, 2022, 9:42:06 AM,lACaj571Gx_VdLF3HKSKUf1Wxx0H_bWxO3BYDZ_C1uw or search the National Eye Institute’s (NEI) resources about dozens of eye conditions and diseases. Get the basics about symptoms, diagnosis, and treatments — or go in depth to see all the details., initial-scale=1.0,lACaj571Gx_VdLF3HKSKUf1Wxx0H_bWxO3BYDZ_C1uw the National Eye Institute’s (NEI) data and statistics on eye health, view eye disease infographics, and find more resources related to eye health., initial-scale=1.0 15, 2022, 4:35:22 PM


100% of pages are optimized for printing

  • All pages of this website appear to be optimized for printing (using CSS).

Media specific CSS detected

MediaMin widthMax widthCSS file

URL format10.0

  • This website uses appropriate web addresses (URLs) throughout. This is excellent and will help search engine placement, usability and the marketability of this website.


1392867Estimated monthly organic visitors

  • This website appears to have a high number of monthly website visits each month

Source: Ahrefs


Last updated May 24, 2023

  • It looks like this website was last updated on Wednesday, May 24, 2023. This is good because visitors perceive up-to-date websites as more credible. Websites that are updated regularly are also spidered by search engines more often.
  • To find this information we used the last modified dates reported by this website's server in addition to looking for dates written on each page.


This website does not appear to be associated with a Twitter account.

  • There was a problem checking the Twitter accounts associated with this website.

Domain agei

  • Sorry, we cannot check the domain age of .gov websites.

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