The different stages of AMD can be classified by the changes an optometrist (optician) or ophthalmologist (hospital eye doctor) sees at the macula and also how much AMD is affecting someone’s vision.

Kentridge, R. W.; Heywood, C. A.; Cowey, A. (2004). "Chromatic edges, surfaces and constancies in cerebral achromatopsia". Neuropsychologia. 42 (6): 821–830. doi: 10.1016/j.neuropsychologia.2003.11.002. PMID 15037060. S2CID 16183218. As we get older, the risk of poor eyesight increases, with the most common causes being cataracts, glaucoma, and age-related macular degeneration (AMD). Many of these conditions are also progressive – which means that there is always a benefit to starting an eye health routine, even if you have one of these conditions already. It's a vegan formulation that's specially designed to support your vision and the health of your eyes over the long term. While extended lifespans are certainly something to celebrate, they also mean that age−related sight problems are on the rise, so it's important to give your precious eyes plenty of support. Retinex® Max contains natural lutein and zeaxanthin, two powerful carotenoids found in high concentrations in the macula, the 'seeing' part of your eye. Lutein and zeaxanthin are also proven to absorb blue light, which is an added bonus for those who spend a lot of time with smartphones and computers! Why is ours better? The effect can be experimentally demonstrated as follows. A display called a "Mondrian" (after Piet Mondrian whose paintings are similar) consisting of numerous colored patches is shown to a person. The display is illuminated by three white lights, one projected through a red filter, one projected through a green filter, and one projected through a blue filter. The person is asked to adjust the intensity of the lights so that a particular patch in the display appears white. The experimenter then measures the intensities of red, green, and blue light reflected from this white-appearing patch. Then the experimenter asks the person to identify the color of a neighboring patch, which, for example, appears green. Then the experimenter adjusts the lights so that the intensities of red, blue, and green light reflected from the green patch are the same as were originally measured from the white patch. The person shows color constancy in that the green patch continues to appear green, the white patch continues to appear white, and all the remaining patches continue to have their original colors.

with H.G. Rogers and V.K. Walworth. (1977) "One-step photography" In Neblette's Handbook of Photography and Reprography, Materials, Processes and Systems, 7th ed., J. M. Sturge, ed., pp.259–330. New York: Reinhold. Reprinted in McCann, vol. I, pp.205–63.

Kalderon, Mark Eli (2008). "Metamerism, Constancy, and Knowing Which" (PDF). Mind. 117 (468): 935–971. doi: 10.1093/mind/fzn043. JSTOR 20532701.National Institute for Health and Care Excellence (NICE) is the organisation that considers the evidence behind treatments for all general health conditions and provide patients, health professionals and the public with reliable guidance on current best medical practice. NICE has not approved the use of antioxidant vitamins and minerals in the management of AMD. Chopra, M., O'Neill, M. E., Keogh, N., Wortley, G., Southon, S., and Thurnham, D. I. Influence of increased fruit and vegetable intake on plasma and lipoprotein carotenoids and LDL oxidation in smokers and nonsmokers. Clin.Chem. 2000;46(11):1818-1829. View abstract. As well as working along lutein and zeaxanthin, vitamin B2 features in Healthspan's Bilberry supplement, for the maintenance of normal vision and to help protect eyes from damage. 5 Creutzfeldt, O. D.; Crook, J. M.; Kastner, S.; Li, C.-Y.; Pei, X. (1991). "The neurophysiological correlates of colour and brightness contrast in lateral geniculate neurons: 1. Population analysis". Experimental Brain Research. 87 (1): 3–21. doi: 10.1007/bf00228503. PMID 1756832. S2CID 1363735.

Krantz, John (2009). Experiencing Sensation and Perception (PDF). Pearson Education, Limited. pp.9.9–9.10. ISBN 978-0-13-097793-9. Archived from the original (PDF) on November 17, 2017 . Retrieved January 23, 2012. New NHS NICE guidelines for AMD (both types) came out in Jan 2018, and despite our Society contributing to the consultation process in support of including AREDS2 supplements being available to those with certain stages of the dry type, it was not included. Ophthalmologists are divided in their opinions on how effective this is, as there is only 1 research trial and the evidence was weak.Our lutein and zeaxanthin come from a natural source of marigolds and are purified in a standardised extraction process to ensure that each vegan tablet contains 10 mg lutein and 1000 µg zeaxanthin. Who is this for? However, so far there’s no other research of the same quality to compare these results to, and so at present this is the only information we must go with regarding vitamin and mineral supplements and AMD. Typical treatment involves eye drops known as artificial tears. These can be successful but may need to be used frequently to prevent burning, itching, grittiness and painful ulceration. Morel, Jean-Michel; Petro, Ana B.; Sbert, Catalina (2009). Eschbach, Reiner; Marcu, Gabriel G; Tominaga, Shoji; Rizzi, Alessandro (eds.). "Fast implementation of color constancy algorithms". Color Imaging XIV: Displaying, Processing, Hardcopy, and Applications. 7241: 724106. Bibcode: 2009SPIE.7241E..06M. CiteSeerX 10.1.1.550.4746. doi: 10.1117/12.805474. S2CID 19950750.