Table.

Demographic and Optical Details of Study Participants

		Cases of Keratoconus		Controls
Age (Years)		19.5 (13–31)		23 (15–26)
Gender, M/F		37/13		6/6
		Stronger Eye	Weaker Eye	Dominant Eye	Nondominant Eye
Visual acuity (logMAR)		0.04 (0.0–0.14)	0.46 (0.3–0.70)	0.00 (0.0–0.0)	0.00 (0.0–0.0)
Keratometry (D)	Max	46 (44.6–49.5)	53.1 (51.2–56.7)	43.60 (43–44.7)	43.5 (42.9–44.7)
	Min	44.6 (43.1–45.7)	47.3 (45.5–50.9)	42.4 (41.9–43.6)	42.6 (41.7–43.2)
D-index (unitless)		4.7 (2.6–6.8)	9.7 (7.8–12.5)	1.4 (0.9–1.7)	1.5 (1.1–1.8)
Refractive error (D)	M	−1.3 (−4.4 to −0.5)	−4.2 (−6.5 to −1.9)	Plano (−0.3 to 0.0)	Plano (−0.3 to 0.0)
	J0	0 (−0.3 to 0.5)	−0.2 (−0.9 to 0.5)	± (0.0 to 0.0)	± (0.0 to 0.0)
	J45	0 (−0.2 to 0.4)	0 (−1.0 to 1.4)	± (0.0 to 0.0)	± (0.0 to 0.0)

All values (except gender distribution) represent median (25th–75th interquartile ranges). Sphero-cylindrical refractive errors are represented as M (spherical equivalent), J0 and J45 cross-cylinder power vectors.³⁰