People may be able to avoid claiming for eye-related problems on expat insurance policies if they maintain a good diet.
Head of external relations at the Macular Disease Society Cathy Yelf claimed evidence suggests vitamin D has a role to play in ocular health.
She suggested that individuals consume high levels of antioxidants – found in fruit and "green leafy vegetables" – in order to maintain good eyesight.
Furthermore, the specialist recommended maintaining a low weight and blood pressure while abstaining from smoking.
Biotechnology and Biological Sciences Research Council researchers recently found the consumption of vitamin D significantly enhances the eyesight of older mice.
However, there is a genetic predisposition to worsening vision, Ms Yelf remarked.
Macular degeneration is a "complex condition in which our genes and our environment play a part", she pointed out.
It is also linked to the ageing process and everyone might develop the ailment if they lived for long enough, the expert stated.