1. Age ≥ 50 years and ≤ 89 years 2. An ETDRS BCVA letter score between ≤ 78 and ≥ 40 in the study eye 3. Diagnosis of subfoveal CNV secondary to AMD in the study eye previously treated with anti-VEGF 4. Must be pseudophakic (at least 12 weeks postcataract surgery) in the study eye. 5. Willing and able to provide written, signed informed consent for this study 6. Participants must have demonstrated a meaningful response to anti-VEGF therapy at study entry 1. CNV or macular edema in the study eye secondary to any causes other than AMD 2. Subfoveal fibrosis or atrophy in the study eye 3. Any condition in the investigator's opinion that could limit VA improvement in the study eye 4. Active or history of retinal detachment in the study eye 5. Uncontrolled glaucoma in the study eye 6. History of intraocular surgery in the study eye within 12 weeks prior to Screening Visit 1 7. History of intravitreal therapy in the study eye, such as intravitreal steroid injection or investigational product, other than anti-VEGF therapy, in the 6 months prior to Screening Visit 1. 8. Prior treatment with gene therapy. 9. Recent myocardial infarction, cerebrovascular accident, or transient ischemic attack within the past 6 months.

General
• Ability and willingness to provide informed consent
• Age ≥ 18 and ≤65 years at time of signing Informed Consent Form
• Ability and willingness to comply with the study protocol and to participate in all study visits and assessments in the investigator's judgement
• For candidates of childbearing potential: willingness to use a method of contraception
• Agreement not to take supplements other than vitamin A Ocular Inclusion Criteria
• Both eyes must exhibit the RP phenotype with evidence of loss of night vision, gradual constriction of visual fields, and maintenance of visual acuity;
• In addition, an eye must meet the following criteria to be included in the study:
• Gradable EZ on a horizontal SD-OCT scan through the fovea center with width ≤ 8000 µm and ≥1500 µm and with well-defined truncation at both the nasal and temporal sides;
• BCVA ≥ ETDRS letter score of 61 (20/60 Snellen equivalent);
• Sufficiently clear ocular media and adequate pupillary dilation to allow good quality images sufficient for analysis and grading by central reading center. General Exclusion Criteria
• Active cancer within the past 12 months, except for appropriately treated carcinoma in situ of the cervix, non-melanoma skin carcinoma, or prostate cancer with Gleason score ≤ 6 and stable prostate specific antigen for > 12 months
• Renal failure requiring renal transplant, hemodialysis, peritoneal dialysis, or anticipated to require hemodialysis or peritoneal dialysis during the study
• Liver disease, cystic fibrosis, asthma, or chronic obstructive pulmonary disease (COPD), history of thrombocytopenia not due to a reversible cause or other blood dyscrasia
• Uncontrolled blood pressure (defined as systolic > 180 and/or diastolic > 100 mmHg while at rest) at screening. If a patient's initial measurement exceeds these values, a second reading may be taken 30 or more minutes later. If the patient's blood pressure must be controlled by antihypertensive medication, the patient may become eligible if medication is taken continuously for at least 30 days.
• History of other disease, physical examination finding, or clinical laboratory finding giving reasonable suspicion that oral NAC may be contraindicated or that follow up may be jeopardized
• Cerebrovascular accident or myocardial infarction within 6 months of screening
• Participation in an investigational study that involves treatment with any drug or device within 6 months of screening
• Three relatives already enrolled in study
• Pregnant, breast feeding, or intending to become pregnant during the study treatment period. Women of childbearing potential who have not had tubal ligation must have a urine pregnancy test at screening.
• Known history of allergy to NAC
• Having taken NAC in any form in the past 4 months
• Phenylketonuria
• Fructose intolerance
• Glucose-galactose malabsorption
• Sucrase-isomaltase insufficiency
• Abnormal laboratory value including the value of alanine aminotransferase (ALT), aspartate aminotransferase (AST), or bilirubin being greater than 1.5 x the upper limit of normal
• Any major abnormal findings on blood chemistry, hematology, and renal function lab tests that in the opinion of the Site Investigator and/or the Study Chair makes the candidate not suitable to participate in the trial
• HIV or hepatitis B infection Ocular Exclusion Criteria
• Evidence of cone-rod dystrophy or pattern dystrophy including focal areas of atrophy or pigmentary changes in the central macula
• Cystoid spaces involving the fovea substantially reducing vision
• Glaucoma or other optic nerve disease causing visual field loss or reduced visual acuity
• Intra ocular pressure >27 mm Hg from two measurements. If a patient's initial measurement exceeds 27 mm Hg, a second reading must be taken.
• Any retinal disease other than RP causing reduction in visual field or visual acuity
• Any prior macular laser photocoagulation
• Intraocular surgery within 3 months prior to screening
• High myopia with spherical equivalent refractive error > 8 diopters. If an eye has had cataract surgery or refractive surgery, a pre-operative refractive error spherical equivalent > 8 diopters is an exclusion
• Any concurrent ocular condition that might affect interpretation of results
• History of uveitis in either eye

• For women of childbearing potential, agreement to remain abstinent (refrain from heterosexual intercourse) or use contraception, during the study for at least 28 days after the last fluorescein injection for the fluorescein angiography (FA) administration
• Study eye: High-risk intermediate AMD
• Macular disease in either eye with subretinal deposits not typical of AMD
• Pigmentary abnormalities of the retina in either eye not typical of AMD
• Atrophy in either eye due to causes other than AMD
• Study eye: Any concurrent or history of ocular or intraocular condition
• Study eye: Intraocular surgery, including cataract surgery, within 3 months prior to Day 1
• Study eye: Retinal tears or peripheral retinal breaks within 3 months prior to Day 1
• Study eye: Concurrent or history of retinal laser photocoagulation or anti-vascular endothelial growth factor (anti-VEGF) treatment for exudative MNV, diabetic macular edema, retinal vein occlusion, or proliferative diabetic retinopathy
• Study eye: Presence of choroidal nevus with overlying drusen in the circle with a radius 3600 micrometer centered on the fovea
• Study eye: Previous participation in interventional clinical trials for GA or early stages of AMD, except for vitamins and minerals, regardless of the route of administration within the last 6 months, except for sham-arm participants
• Study eye: History of glaucoma surgery, corneal transplant, retinal pigment epithelium tear, retinal tear that involves the macula, retinal detachment
• Either eye: Uncontrolled progressive glaucoma
• Either eye: Moderate or severe non-proliferative diabetic retinopathy or proliferative diabetic retinopathy
• Either eye: History of recurrent infectious or inflammatory ocular disease
• Any concurrent or history of taking medications that can induce retinal toxicity

• Age ≥ 18 or ≤ 65 years
• Patients with rhegmatogenous retinal detachment that require vitrectomy surgery
• Previous pars plana vitrectomy in the affected eye
• Positive for Hepatitis B surface antigen or HIV antibodies, or history of Hepatitis B/HIV
• Pregnant or breast-feeding
• Liver disease or abnormal AST/ALT
• Renal impairment (Creatinine clearance < 50)
• Diabetes with current use of insulin
• Anemia (Hemoglobin <13.2 g/dL (male) or < 11.6 g/dL (female))
• Unwilling to hold concurrent use of sorbitol or sorbitol-containing medications or products while taking study medication(including, but not limited to: blackberries, raspberries, strawberries, stone fruits, apples, avocados, sugar-free items such as chewing gum, hard candies, snack bars, frozen desserts, and chocolates, liquid and capsule/caplet analgesics, cough/cold/flu syrup, liquid and capsule/caplet pseudoephedrine, chewable antacid tablets, liquid and capsule allergy medications, motion sickness and nausea medications)
• Current use of trimethoprim-sulfamethoxazole
• Pancreatitis or history of pancreatitis
• Uncontrolled blood pressure (> 160 mm Hg systolic or >100 mm Hg diastolic) within the last 3 months, or current use of more than one anti-hypertensive medication
• History of stroke, myocardial infarction, or congestive heart failure
• Current vitreous hemorrhage that obscures view of retinal details
• Patients with a shallow anterior chamber or in whom anterior chamber paracentesis is considered unsafe