| Name | Info | Provider | Link |
|---|---|---|---|
| Cataract | free resource | MedlinePlus Health Information | https://medlineplus.gov/cataract.html |
| subscription/membership/fee required | Georg Thieme Verlag Stuttgart, New York | https://www.thieme-connect.com/DOI/DOI?10.1055/s-0035-1546174 |