Comparison of Optical versus Ultrasonic Biometry in Keratoconic Eyes

Table 1

Comparison of the demographic features of the patients with KC enrolled in the study.

Feature	Mean	SD	Range
	𝑛=42 patients
Gender
Male			20
Female			22
Age (years)	19.06	5.33	10	32
	𝑛=42 eyes
BCVA (Snellen)	0.47	0.26	0.02	1
Spheric value (D)	−2.70	3.39	−17.75	1.5
Cylindric value (D)	−4.65	1.59	−8.25	−2.00
SE (D)	−5.37	3.70	−19.00	−0.75
𝐾1 (D)	48.15	4.56	42.70	65.6
𝐾2 (D)	52.73	4.65	47.0	66.9
𝐾𝑚 (D)	50.36	4.48	44.9	66.2

SD: standard deviation, D: diopter, SE: spherical equivalent; 𝐾₁: simulated keratometric value at flat axis, 𝐾₂: simulated keratometric value at steep axis, and 𝐾_𝑚: mean keratometric value.