Study of Serine Supplementation to Protect Vision in MacTel

Inclusion Criteria * Be able to read, comprehend, and agree to conditions as explained in the informed consent document and provide written informed consent; * Be at least 18 years of age; * Enrolled or enrolling in the Natural History Observation and Registry Study (NHOR) and confirmed with MacTel type 2 by the Reading Center in at least one eye\*; * Participant has clear ocular media (both eyes) for sufficient image quality; * Participant must have steady fixation in the foveal or parafoveal area; * Female participants of childbearing potential must agree to use a highly effective method of contraception from the time consent is signed until six days after treatment discontinuation (this is due to a lack of safety data on use of L-serine in pregnant and breastfeeding women; and to allow for medication wash out post treatment discontinuation). Highly effective methods of contraception include: (i)Combined hormonal contraception associated with inhibition of ovulation, (ii) progesterone only hormonal contraception associated with inhibition of ovulation (iii) Intrauterine devices, (iv) surgical sterilization such as bilateral tubal occlusion or vasectomized partner or (v) true abstinence (refraining from heterosexual intercourse during the entire period associated with the study treatments, and the reliability of sexual abstinence is in line with the usual lifestyle of the subject) * Willing and able to comply with study protocol and follow-up visits * Agree to unconditio…