The phrase "normal retina" refers to a healthy and functioning retina, which is the layer of tissue located at the back of the eye. It means that there are no physical or structural abnormalities or diseases affecting the retina. Full definition
The researchers looked at the activity of 112 genes in diseased retinas and compared it to gene activity in normal retinas. (sciencedaily.com)
When they incubated normal retinas with labeled DHA, they measured abundant levels of it, demonstrating that a functional AdipoR1 gene must be present for DHA uptake and retention. (sciencedaily.com)
Their results showed that both forms of RP had clear differences in gene expression compared to normal retinas. (sciencedaily.com)