Clinical Applications of Advanced Ophthalmic Imaging

Observational Phase 1 Group Inclusion Criteria: 1. Self-reported normal healthy subjects; 2. Clinical diagnosis of Alzheimer's Disease, mild cognitive impairment, multiple sclerosis, dry eye, myopia, diabetics and stroke; 3. Who can keep the eye open for imaging. Exclusion Criteria: 1. who can not read and sign the ICF; 2. who can not receiving ophthalmic imaging; 3. who cannot tolerate bright light during imaging. Interventional Phase 2 Group: Inclusion criteria The participant will be eligible for entry in the study if s/he: 1. Is at least 18 years old and has full legal capacity to volunteer; 2. Has read and signed the IRB Informed Consent Document; 3. Is willing and able to follow participant instructions; 4. Has clear corneas and crystalline lens; 5. Initial visual acuities were 20/80 or better; 6. MTHFR C677TT homozygous, or MTHFR C677T/A1298C compound heterozygous with mild to moderate micro-aneurismal vascular retinopathy disease; 7. Hemoglobin A1c is 10 or less; 8. Normotensive with or without medications; 9. Without retinal capillary dropout or macular edema; 10. Blood homocysteine \> 9. Exclusion criteria The subjects will be ineligible for entry into the study if s/he: 1. Has an active ocular disease; 2. Has had surgery or an eye injury within 6 months.