functional groups such as CHO, CO, NH 2 , OH, COOH, COC, CN, NO, SH, or polymer aggregates. [11] Moreover, CDs are considered to be the most recent form of zero-dimensional carbon, with a diameter of less than 10 nm and excellent fluorescent properties. [12] These properties have led to their application in biomedical engineering [13] and sensor technology, [14,15] including heavy metal ion detection, [16] fluorescent labeling and nucleus targeted imaging of cells, [17] targeting of drug delivery for anti-tumor therapy, [18] photovoltaic devices/solar cell, [19] photocatalysts, [20] dye degradation, [21] lubricant additive, [22] supercapacitor, [23] nanoelectronic devices, [24] fuel cells, [25] anti-viral therapy, [26] photodynamic therapy, [27] gene delivery, [28] and disruption of the fibrillation of amyloidogenic peptides, such as Aβ. [29,30] Recently, Shah et al. have investigated the presence of Aβ in aging eyes and its significance in relation to Alzheimer's disease (AD) pathology. [31] They have also discussed clinical studies investigating the in vivo ocular imaging of Aβ and its relationship to brain Aβ burden, as well as therapies that target ocular Aβ. [31] Therefore, the characterization of retinal Aβ is also necessary in order to differentiate it from eye-related diseases.According to the World Health Organization, more than 2.2 billion individuals were affected by some form of visual impairment in 2020, with an estimated 35 million blind individuals. [32][33][34] Among the leading causes of vision loss Carbon quantum dots (CDs) are a class of emerging carbonaceous nanomaterials that have received considerable attention due to their excellent fluorescent properties, extremely small size, ability to penetrate cells and tissues, ease of synthesis, surface modification, low cytotoxicity, and superior water dispersion. In light of these properties, CDs are extensively investigated as candidates for bioimaging probes, efficient drug carriers, and disease diagnostics. Functionalized CDs represent a promising therapeutic candidate for ocular diseases. Here, this work reviews the potential use of functionalized CDs in the diagnosis and treatment of eye-related diseases, including the treatment of macular and anterior segment diseases, as well as targeting Aβ amyloids in the retina.