The ability to read is crucial for functioning effectively in everyday life. However, numerous studies indicate that many aspects of reading performance differ between young adults (aged 30 years and under) and older adults (aged 65 years and over; e.g., Kliegl, Grabner, Rolfs, & Engbert, 2004; Rayner, Castelhano, & Yang, 2009;Rayner, Reichle, Stroud, Williams, & Pollatsek, 2006; see also Laubrock, Kliegl, & Engbert, 2006) and these differences are widely attributed to normal sensory and cognitive decline. But the precise nature of the differences in reading performance that occur as adults reach older age has yet to be fully determined.Of particular importance is that the eyes move when reading and make a series of brief fixational pauses, with the effect that different areas of text can be viewed within central vision (an area approximately 2° wide around the point of fixation; for a review, see Rayner, 2009).Crucially, during these pauses, the visual system acquires only low-level visual properties from text and these visual properties then provide the bases for the subsequent linguistic analyses that ultimately allow readers to make sense of what they are seeing (e.g., Allen, Smith, Lien, Kaut, & Canfield, 2009;Lovegrove, Bowling, Badcock, & Blackwood, 1980;Patching & Jordan, 2005a, 2005b. Indeed, the low-level properties of text falling within central vision provide a range of different scales of visual analysis (spatial frequencies) that are associated with different aspects of the text being read. So, for example, lower spatial frequencies allow readers to see a word's coarse overall shape but not its fine detail, whereas higher spatial frequencies allow readers to see a word's fine detail, such as the precise form of individual letter features (e.g., Allen et al., 2009;Jordan, 1990Jordan, , 1995Kwon & Legge, 2012;Legge, Pelli, Rubin, & Schleske, 1985; Patching & Jordan, 2005a,b). Thus, although spatial frequency analyses in central vision are unlikely to be apparent to the reader, reading relies fundamentally on these low-level visual properties of text. But it is unclear whether the effectiveness of spatial frequencies within central vision shown by young adults remains unaltered in older age. Of particular significance is that normal aging produces a characteristic decline in sensitivity to various scales of spatial frequency, especially to higher spatial frequencies within central vision, due to a combination of optical changes and changes in neural transmission (for discussions, see Derefelt, Lennerstrand, & Lundh, 1979;Elliott, 1987;Higgins, Jaffe, Caruso, & deMonasterio, 1988;Laubrock et al., 2006;Owsley, 2011). As a result, older adults may be less able than young adults to process the visual detail of text falling within central vision during fluent reading, and this change may affect reading performance. Indeed, it is widely assumed that reading relies greatly on visual detail from within central vision (e.g., Engbert, Nuthmann, Richter, & Kliegl, 2005;Reichle, Rayner, & Pollatsek, 2003; see als...