
A cross-sectional study assessed the quantitative contrast sensitivity function (qCSF) in 43 eyes with early keratoconus (Early-KC) and 77 normal control (NC) eyes, all with corrected distance visual acuity ≥ 20/20. Results showed significant reductions in area under the log CSF, contrast sensitivity acuity, and contrast sensitivity at both low and high spatial frequencies in the Early-KC group (P < 0.05). Subgroup analysis indicated similar declines in subclinical keratoconus and those with significant astigmatism. The findings highlight that qCSF can effectively detect visual performance issues in early keratoconus.
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