Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Genetic variants (G) that are associated with the exposure (X, such as myopia) are used as instrumental variable. The association of genetic variants with the outcome (Y, such as retinal detachment) is only mediated through the exposure.
