Analysis of Daily Visual Habits in a Presbyopic Population

Table 1

Summary of the main clinical data obtained in the sample of patients evaluated.

Mean (SD)	Right eye	Left eye
Median (range)
Sphere (D)	−0.28 (3.08)	−0.06 (3.06)
	0.63 (−10.75–3.25)	1.00 (−9.50–4.50)
Cylinder (D)	−0.79 (0.94)	−0.53 (0.87)
	−0.50 (−3.00–0.00)	−0.38 (−3.25–0.00)
SE (D)	−0.68 (3.28)	−0.33 (3.31)
	0.56 (−11.75–3.00)	0.94 (−10.38–4.25)
K1 (D)	43.18 (2.13)	43.29 (2.02)
	43.13 (39.55–49.67)	42.94 (40.12–49.46)
K2 (D)	44.07 (2.04)	44.04 (1.98)
	43.66 (40.91–50.00)	43.64 (41.06–49.80)
CA (D)	0.97 (0.89)	0.83 (0.68)
	0.60 (0.04–3.39)	0.66 (0.05–2.99)
WTW (mm)	12.00 (0.40)	12.01 (0.36)
	12.03 (11.06–12.70)	12.03 (11.20–12.66)
AL (mm)	23.93 (1.47)	23.77 (1.44)
	23.80 (21.53–27.51)	23.70 (21.41–27.09)
CCT (μm)	543.72 (21.82)	543.69 (22.00)
	547.50 (498.00–579.00)	548.00 (499.00–584.00)
ACD (mm)	2.84 (0.41)	2.80 (0.40)
	2.86 (1.98–3.88)	2.76 (1.98–3.73)
LT (mm)	4.31 (0.35)	4.33 (0.33)
	4.36 (3.24–4.96)	4.33 (3.47–5.02)
% Time dedicated to distance vision	27.25 (11.93)
	27.00 (5 to 65)
% Time dedicated to intermediate vision	30.23 (9.36)
	29.50 (12– 50)
% Time dedicated to near vision	42.53 (14.96)
	43.00 (13–78)
% Time performing activities under photopic conditions	37.08 (23.20)
	30.50 (5– 87)
% Time performing activities under mesopic conditions	33.65 (13.84)
	33.00 (6–67)
% Time performing activities under scotopic conditions	29.28 (17.03)
	29.50 (4–65)
% Time with digital screens	18.98 (10.48)
	19.00 (2–48)

Abbreviations: SD, standard deviation; SE, spherical equivalent; K1, flattest keratometric reading; K2, steepest keratometric reading; CA, corneal astigmatism; WTW, white-to-white corneal diameter; AL, axial length; CCT, central corneal thickness; ACD, anterior chamber depth; LT, lens thickness.