The ailment has significantly impaired Scheidies' central vision, and he sees mostly in blurs aside from some peripheral sight.
With dry AMD, there is usually a gradual loss of central vision.
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It is the leading cause of severe vision loss in the over-50s in the developed world and affects central vision, needed for driving.
Its hallmark is yellowish deposits of debris called drusen that grow at the back of the eye, damaging the macula, the tiny but crucial section of the retina responsible for central vision.
To solve the problem, doctors sometimes resort to the radical step of using lasers to kill retina cells responsible for peripheral vision in order to preserve enough oxygen for those engaged in central vision.
Central to his vision for British diplomacy is the promotion of national economic interests abroad.
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For both men, central to that vision was a vision of government.
The reality is that the same moral principles that underpinned the Bush appeal on "values" issues like gay marriage, stem-cell research, and the right to life were central to his vision of U.S. war aims and foreign policy.
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When London's selection as the next host of the Olympics was made in July 2005, Culture Secretary Tessa Jowell described the Cultural Olympiad as "absolutely central" to the vision of what could be achieved.
The measures, contained in the government's Localism Bill, currently in its final Parliamentary stages, are central to Mr Cameron's Big Society vision.
His vision of America extended to the quality of the national culture and the central role of the arts in a vital society.
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