The five-year study specifically showed that a higher intake of vegetable fat increased the rate of progression of macular degeneration.
Evidence of enhanced progression was also evident with animal fats, but to a lesser extent.
Moreover, it found that diets rich in meat and dairy also heightened the risk of macular degeneration, but not as much as baked food.
Conversely, individuals who ate higher amounts of fish and nuts, reduced the risk of the disease progressing.
Other dark leafy foods can promote eye health because they are rich in the antioxidants lutein and zeaxanthin, which are present in high concentrations in the retina.