sightstudies.org Sightstudies.org

   
CDC Vision Health Initiative Coordinating Center at Columbia University | Vagelos College of Physicians and Surgeons

Domain Summary

What is the traffic rank for Sightstudies.org?

• Sightstudies.org ranks #24,989,566 globally on HypeStat.

What IP addresses does Sightstudies.org resolve to?

• Sightstudies.org resolves to the IP addresses 151.101.66.228.

Where are Sightstudies.org servers located in?

• Sightstudies.org has servers located in San Francisco, California, 94107, United States.

sightstudies.org Profile

Title:CDC Vision Health Initiative Coordinating Center at Columbia University | Vagelos College of Physicians and Surgeons Description:The Coordinating Center for the Vision Health Initiative aims to evaluate the effectiveness of telehealth-based programs to detect glaucoma among high-risk populations in community health settings.
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What technologies does sightstudies.org use?

These are the technologies used at sightstudies.org. sightstudies.org has a total of 10 technologies installed in 10 different categories.
CMS
Drupal Drupal
CDN
Fastly Fastly
Databases
MariaDB MariaDB
Web Servers
Nginx Nginx
Reverse proxies
Nginx Nginx
Programming Languages
PHP PHP
PaaS
Pantheon Pantheon
Caching
Varnish Varnish
Security
HSTS HSTS
Miscellaneous
Open Graph Open Graph
PWA PWA

sightstudies.org Traffic Analysis

Sightstudies.org is ranked #24,989,566 in the world.
Daily Visitors n/a
Monthly Visits n/a
Pages per Visit n/a
Visit duration n/a
Bounce Rate n/a
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Daily Unique Visitors:
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Monthly Visits:
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Pages per Visit:
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Daily Pageviews:
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Avg. visit duration:
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Bounce rate:
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Global Reach:
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HypeRank:
24,989,566
*All traffic values are estimates only.

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Domain:
  sightstudies.org
Rank:
(Rank based on keywords, cost and organic traffic)
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Organic Keywords:
(Number of keywords in top 20 Google SERP)
  0
Organic Traffic:
(Number of visitors coming from top 20 search results)
  0
Organic Cost:
((How much need to spend if get same number of visitors from Google Adwords)
  $0.00
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*HypeStat.com is not promoting or affiliated with sightstudies.org in any way. Only publicly available statistics data are displayed.

Ad Experience Report ▼

Summary of the ad experience rating of a website for a specific platform.

Mobile summary

Root domain:
sightstudies.org
Ad filtering:
(Chrome is not filtering ads on your site.)
Off
Status:
(The status of the site that is reviewed for the Better Ads Standards.)
Not reviewed

Desktop summary

Root domain:
sightstudies.org
Ad filtering:
(Chrome is not filtering ads on your site.)
Off
Status:
(The status of the site that is reviewed for the Better Ads Standards.)
Not reviewed

Abusive Experience Report ▼

Summary of the abusive experience rating of a website.
Root domain:
sightstudies.org
Enforcement:
(Chrome is not preventing your site from opening new windows or tabs.)
Off
Status:
(The status of the site reviewed for the abusive experiences.)
Not reviewed

Where is sightstudies.org hosted? ▼

Sightstudies.org may be hosted in multiple data centers distributed in different locations around the world. This is probably just one of them.
Server IP:
151.101.66.228
ASN:
AS54113 
ISP:
Fastly 
Server Location:
San Francisco
California, CA
94107
United States, US
 

Other sites hosted on 151.101.66.228

How fast does sightstudies.org load? ▼

The average loading time of sightstudies.org is 396 ms. The Desktop speed index is 75 and mobile speed index is 62.
Average Load Time:
396 ms

Page Speed (Google PageSpeed Insights) - Desktop

75
0-49 50-89 90-100 i

Field Data

Over the last 30 days, the field data shows that this page has a AVERAGE speed compared to other pages in the Chrome User Experience Report.We are showing the 90th percentile of FCP and the 95th percentile of FID.

Cumulative Layout Shift (CLS)7ms 78% of loads for this page have a fast (<0.01s) Cumulative Layout Shift (CLS) 78% 7% of loads for this page have an average (0.01s ~ 0.025s) Cumulative Layout Shift (CLS) 7% 13% of loads for this page have a slow (>0.025s) Cumulative Layout Shift (CLS) 13%
Time To First Byte (TTFB)1.7s 58% of loads for this page have a fast (<0.8s) Time To First Byte (TTFB) 58% 18% of loads for this page have an average (0.8s ~ 1.8s) Time To First Byte (TTFB) 18% 22% of loads for this page have a slow (>1.8s) Time To First Byte (TTFB) 22%
First Contentful Paint (FCP)1.9s 73% of loads for this page have a fast (<1.8s) First Contentful Paint (FCP) 73% 19% of loads for this page have an average (1.8s ~ 3s) First Contentful Paint (FCP) 19% 7% of loads for this page have a slow (>3s) First Contentful Paint (FCP) 7%
First Input Delay (FID)0 0% of loads for this page have a fast (<0ms) First Input Delay (FID) 0% 0% of loads for this page have an average (0ms ~ 0ms) First Input Delay (FID) 0% 0% of loads for this page have a slow (>0ms) First Input Delay (FID) 0%
Interaction To Next Paint (INP)49ms 98% of loads for this page have a fast (<200ms) Interaction To Next Paint (INP) 98% 0% of loads for this page have an average (200ms ~ 500ms) Interaction To Next Paint (INP) 0% 0% of loads for this page have a slow (>500ms) Interaction To Next Paint (INP) 0%
Largest Contentful Paint (LCP)2.0s 84% of loads for this page have a fast (<2500ms) Largest Contentful Paint (LCP) 84% 11% of loads for this page have an average (2500ms ~ 4000ms) Largest Contentful Paint (LCP) 11% 3% of loads for this page have a slow (>4000ms) Largest Contentful Paint (LCP) 3%

Origin Data

All pages served from this origin have an AVERAGE speed compared to other pages in the Chrome User Experience Report. over the last 30 days.To view suggestions tailored to each page, analyze individual page URLs.

Cumulative Layout Shift (CLS)7ms 78% of loads for this page have a fast (<0.01s) Cumulative Layout Shift (CLS) 78% 7% of loads for this page have an average (0.01s ~ 0.025s) Cumulative Layout Shift (CLS) 7% 13% of loads for this page have a slow (>0.025s) Cumulative Layout Shift (CLS) 13%
Time To First Byte (TTFB)1.7s 58% of loads for this page have a fast (<0.8s) Time To First Byte (TTFB) 58% 18% of loads for this page have an average (0.8s ~ 1.8s) Time To First Byte (TTFB) 18% 22% of loads for this page have a slow (>1.8s) Time To First Byte (TTFB) 22%
First Contentful Paint (FCP)1.9s 73% of loads for this page have a fast (<1.8s) First Contentful Paint (FCP) 73% 19% of loads for this page have an average (1.8s ~ 3s) First Contentful Paint (FCP) 19% 7% of loads for this page have a slow (>3s) First Contentful Paint (FCP) 7%
First Input Delay (FID)0 0% of loads for this page have a fast (<0ms) First Input Delay (FID) 0% 0% of loads for this page have an average 0ms ~ 0ms) First Input Delay (FID) 0% 0% of loads for this page have a slow (>0ms) First Input Delay (FID) 0%
Interaction To Next Paint (INP)49ms 98% of loads for this page have a fast (<200ms) Interaction To Next Paint (INP) 98% 0% of loads for this page have an average (200ms ~ 500ms) Interaction To Next Paint (INP) 0% 0% of loads for this page have a slow (>500ms) Interaction To Next Paint (INP) 0%
Largest Contentful Paint (LCP)2.0s 84% of loads for this page have a fast (<2500ms) Largest Contentful Paint (LCP) 84% 11% of loads for this page have an average (2500ms ~ 4000ms) Largest Contentful Paint (LCP) 11% 3% of loads for this page have a slow (>4000ms) Largest Contentful Paint (LCP) 3%

Lab Data

Max Potential First Input Delay 130 ms
The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric
Time to Interactive 1.9 s
Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric
First Contentful Paint 1.3 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more about the First Contentful Paint metric
Speed Index 1.3 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more about the Speed Index metric
Largest Contentful Paint 1.4 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn more about the Largest Contentful Paint metric
Total Blocking Time 40 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more about the Total Blocking Time metric
INP breakdown  
Start investigating by looking at the longest subpart. how to improve INP

Page Speed (Google PageSpeed Insights) - Mobile

62
0-49 50-89 90-100 i

Field Data

Over the last 30 days, the field data shows that this page has a SLOW speed compared to other pages in the Chrome User Experience Report.We are showing the 90th percentile of FCP and the 95th percentile of FID.

Cumulative Layout Shift (CLS)0ms 78% of loads for this page have a fast (<0.01s) Cumulative Layout Shift (CLS) 93% 4% of loads for this page have an average (0.01s ~ 0.025s) Cumulative Layout Shift (CLS) 4% 2% of loads for this page have a slow (>0.025s) Cumulative Layout Shift (CLS) 2%
Time To First Byte (TTFB)1.9s 58% of loads for this page have a fast (<800s) Time To First Byte (TTFB) 57% 14% of loads for this page have an average (800s ~ 1800s) Time To First Byte (TTFB) 14% 27% of loads for this page have a slow (>1800s) Time To First Byte (TTFB) 27%
First Contentful Paint (FCP)2.3s 73% of loads for this page have a fast (<1.8s) First Contentful Paint (FCP) 66% 18% of loads for this page have an average (1.8s ~ 3s) First Contentful Paint (FCP) 18% 15% of loads for this page have a slow (>3s) First Contentful Paint (FCP) 15%
First Input Delay (FID)0 0% of loads for this page have a fast (<0ms) First Input Delay (FID) 0% 0% of loads for this page have an average (0ms ~ 0ms) First Input Delay (FID) 0% 0% of loads for this page have a slow (>0ms) First Input Delay (FID) 0%
Interactive To Next Paint (INP)84ms 98% of loads for this page have a fast (<200s) Interactive To Next Paint (INP) 96% 3% of loads for this page have an average (200s ~ 500s) Interactive To Next Paint (INP) 3% 0% of loads for this page have a slow (>500s) Interactive To Next Paint (INP) 0%
Largest Contentful Paint (LCP)2.5s 84% of loads for this page have a fast (<2500s) Largest Contentful Paint (LCP) 75% 15% of loads for this page have an average (2500s ~ 4000s) Largest Contentful Paint (LCP) 15% 9% of loads for this page have a slow (>4000s) Largest Contentful Paint (LCP) 9%

Origin Data

All pages served from this origin have an SLOW speed compared to other pages in the Chrome User Experience Report. over the last 30 days.To view suggestions tailored to each page, analyze individual page URLs.

Cumulative Layout Shift (CLS)0ms 93% of loads for this page have a fast (<0.01s) Cumulative Layout Shift (CLS) 93% 4% of loads for this page have an average (0.01s ~ 0.025s) Cumulative Layout Shift (CLS) 4% 2% of loads for this page have a slow (>0.025s) Cumulative Layout Shift (CLS) 2%
Time To First Byte (TTFB)1.9s 57% of loads for this page have a fast (<0.8s) Time To First Byte (TTFB) 57% 14% of loads for this page have an average (0.8s ~ 1.8s) Time To First Byte (TTFB) 14% 27% of loads for this page have a slow (>1.8s) Time To First Byte (TTFB) 27%
First Contentful Paint (FCP)2.3s 66% of loads for this page have a fast (<1.8s) First Contentful Paint (FCP) 66% 18% of loads for this page have an average (1.8s ~ 3s) First Contentful Paint (FCP) 18% 15% of loads for this page have a slow (>3s) First Contentful Paint (FCP) 15%
First Input Delay (FID)0 0% of loads for this page have a fast (<0ms) First Input Delay (FID) 0% 0% of loads for this page have an average 0ms ~ 0ms) First Input Delay (FID) 0% 0% of loads for this page have a slow (>0ms) First Input Delay (FID) 0%
Interactive To Next Paint (INP)84ms 96% of loads for this page have a fast (<0.2s) Interactive To Next Paint (INP) 96% 3% of loads for this page have an average (0.2s ~ 0.5s) Interactive To Next Paint (INP) 3% 0% of loads for this page have a slow (>0.5s) Interactive To Next Paint (INP) 0%
Largest Contentful Paint (LCP)2.5s 75% of loads for this page have a fast (<2.5s)Largest Contentful Paint (LCP) 75% 15% of loads for this page have an average (2.5s ~ 4s)Largest Contentful Paint (LCP) 15% 9% of loads for this page have a slow (>4s)Largest Contentful Paint (LCP) 9%

Lab Data

Largest Contentful Paint 6.9 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn more about the Largest Contentful Paint metric
Max Potential First Input Delay 160 ms
The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric
INP breakdown  
Start investigating by looking at the longest subpart. how to improve INP
Speed Index 5.2 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more about the Speed Index metric
First Contentful Paint 5.2 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more about the First Contentful Paint metric
Total Blocking Time 110 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more about the Total Blocking Time metric
LCP request discovery  
by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading Optimize LCP
Time to Interactive 8.7 s
Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric

Does sightstudies.org use compression? ▼

Website compression is the process of reducing the size of website files, such as HTML, CSS, JavaScript, and image files, to improve website performance and load times. Compressing website files can significantly reduce the amount of data that needs to be transferred from the server to the user's browser, resulting in faster page load times and improved user experience. Files on sightstudies.org are reduced by 77%.
sightstudies.org use gzip compression.
Original size: 226.92 KB
Compressed size: 51.46 KB
File reduced by: 175.46 KB (77%)

Google Safe Browsing ▼

Google Safe Browsing is a service provided by Google that helps protect users from visiting websites that may contain malicious or harmful content, such as malware, phishing attempts, or deceptive software.
This site is not currently listed as suspicious

MyWot.com Reputation Ratings

MyWOT (short for "My Web of Trust") is a web-based reputation and rating service that provides users with information about the trustworthiness and safety of websites.
Status:
  SAFE

SSL Checker - SSL Certificate Verify ▼

An SSL (Secure Sockets Layer) certificate is a digital certificate that establishes a secure encrypted connection between a web server and a user's web browser. It provides authentication and encryption, ensuring that data transmitted between the server and the browser remains private and protected. sightstudies.org supports HTTPS.
 sightstudies.org supports HTTPS
     
Verifying SSL Support. Please wait...
Common Name: cuimc.columbia.edu
Organization: Columbia University
Location: New York, US
Issuer: InCommon RSA Server CA 2
Valid from: Dec 21 00:00:00 2025 GMT
Valid until: Jan 21 23:59:59 2027 GMT
Authority: CA:FALSE
Keysize: 2048 Bits
Common Name: InCommon RSA Server CA 2
Organization: Internet2
Location: US
Issuer: USERTrust RSA Certification Authority
Valid from: Nov 16 00:00:00 2022 GMT
Valid until: Nov 15 23:59:59 2032 GMT
Authority: CA:TRUE
Keysize: 3072 Bits
Common Name: USERTrust RSA Certification Authority
Organization: The USERTRUST Network
Location: Jersey City, New Jersey, US
Issuer: AAA Certificate Services
Valid from: Mar 12 00:00:00 2019 GMT
Valid until: Dec 31 23:59:59 2028 GMT
Authority: CA:TRUE
Keysize: 4096 Bits

Verify HTTP/2 Support ▼

HTTP/2 (Hypertext Transfer Protocol version 2) is a major revision of the HTTP protocol, which is the foundation of data communication on the World Wide Web. It was developed as an improvement over the previous HTTP/1.1 version to enhance web performance and efficiency.
 sightstudies.org supports HTTP/2
     
Verifying HTTP/2.0 Support. Please wait...

Http Header ▼

HTTP headers are extra portions of records despatched among a consumer (which include an internet browser) and a server at some stage in an HTTP request or response. They offer instructions, metadata, or manipulate parameters for the conversation among the consumer and server. 
server: Varnish
retry-after: 0
location: https://www.vagelos.columbia.edu/departments-centers/ophthalmology/research/research-areas/cdc-vision-health-initiative
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HTTP/2 301 
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expires: Sun, 19 Nov 1978 05:00:00 GMT
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HTTP/2 200 
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expires: Sun, 19 Nov 1978 05:00:00 GMT
last-modified: Sat, 03 Jan 2026 14:07:49 GMT
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DNS Lookup ▼

DNS entries (Domain Name System) are a critical component of the Internet infrastructure. They act as directories that translate human-readable domain names (such as example.com) to machine-readable IP addresses. DNS records are stored on DNS servers and help forward internet traffic efficiently.
Type Ip Target/Txt TTL
A 151.101.130.228 7200
A 151.101.2.228 7200
A 151.101.66.228 7200
A 151.101.194.228 7200
NS ns-320.awsdns-40.com 86400
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SOA 900
Mname ns-1135.awsdns-13.org
Rname awsdns-hostmaster.amazon.com
Serial Number 1
Refresh 7200
Retry 900
Expire 1209600
Minimum TTL 86400