Gene therapy uses delivery, replacement or modification of genetic material to change cellular function for a therapeutic purpose. It includes gene addition as well as some forms of genome editing; changing the inherited germline is not required. The delivered sequence, delivery system and target cell type are distinct components of the intervention. [ref]
An experimental example introduced a long-wavelength opsin into adult dichromatic squirrel monkeys. Behavioural colour-discrimination measurements changed after treatment, linking genetic delivery to a functional sensory outcome in that model. This was an adult primate experiment, not a demonstration that the same intervention works for every human visual disorder. [ref]
Gene therapy for red-green colour blindness in adult primates by Katherine Mancuso and others. 2009, adult squirrel-monkey treatment and colour-discrimination testing
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Gene therapy is a medical technique that involves altering the genes inside a patient's cells to treat or prevent disease. The goal of gene therapy is to correct or replace faulty genes that are responsible for disease development or progression. There are several approaches to gene therapy, including: 1. **Gene Replacement**: Introducing a normal copy of a gene to replace a mutated or nonfunctional gene.