What is the purpose of making a site retina ready?

Related questions

1. Is the image formed on the retina real?
2. What happens to light after it reaches the retina?
3. Where is the image formed in human eye?
4. How does the retina see images?
5. How do I create a drop down menu in navigation bar?
6. What is retina design?
7. Is the white of the eye?
8. What is the site icon?
9. Is retina display LED or LCD?
10. How image is formed in retina?

Tags

1. #something
2. #create
3. #vivid
4. #colors
5. #sharp
6. #pixels
7. #behind
8. #retina
9. #ready
10. #print
11. #devices
12. #would
13. #websites
14. #because
15. #benefits
16. #bright