Ultrasound Biomicroscopy Measurements of the Normal Thickness for the Ciliary Body and the Iris in a Middle East Population

Figures & data

Figure 1 Ultrasound biomicroscopy (UBM). (A) shows a scheme and (B) shows a real Image of the iris and the ciliary body depicting where thickness measurements of the iris [iris thicknesses at 0.8 mm from the iris root (1, blue line), midway along the radial length of the iris (2, yellow line), and at the juxtapupillary margin (3, red line)], and the ciliary body [ciliary body (4, blue line), and ciliary body with ciliary processes (5, green line)] were obtained. (C) Real measurements for one of the patients were the iris thicknesses at 0.8 mm from the iris root was 0.42mm, at midway along the radial length of the iris was 0.52mm, and at the juxtapupillary margin was 0.7mm. The ciliary body thickness was 0.72 mm and the ciliary body with ciliary processes thickness was 1.38mm.

Table 1 Ciliary Body Thickness (mm) Comparison by Gender, Age, Height, Eye and Quadrant [Mean, Median ± SD (Range)]

Parameter	Ciliary Body	Ciliary Body + Ciliary Processes
Over all thickness (83 eyes)	0.72, 0.71 ± 0.1 (0.43–1.14)	1.42, 1.37 ± 0.2 (1.20–1.75)
Gender
Female (n = 31eyes, 18 patient)	0.70, 0.69 ± 0.10 (0.43–1.14)	1.40, 1.35 ± 0.10 (1.20–1.70)
Male (n = 52 eyes, 28 patient)	0.72, 0.70 ± 0.10 (0.45–1.12)	1.44, 1.38 ± 0.10 (1.32–1.75)
P value	0.33	0.43
Age (year)
< 40 (n = 48)	0.75, 0.74 ± 0.2 (0.47–1.14)	1.44, 1.40 ± 0.2 (1.25–1.75)
> 40 (n = 35)	0.70, 0.69 ± 0.1 (0.43–1.08)	1.38, 1.36 ± 0.1 (1.20–1.60)
P value	0.54	0.66
Height
< 160 cm (n = 49)	0.71, 0.70 ± 0.1 (0.43–1.1)	1.40, 1.34 ± 0.1 (1.20–1.60)
> 160 cm (n = 34)	0.74, 0.72± 0.2 (0.46–1.14)	1.45, 1.38 ± 0.2 (1.30–1.75)
P value	0.93	0.78
Eye
Right (n = 40)	0.72, 0.71 ± 0.10 (0.44–1.12)	1.43, 1.38 ± 0.2 (1.3–1.75)
Left (n = 43)	0.72, 0.70 ± 0.10 (0.43–1.14)	1.41, 1.36 ± 0.2 (1.2–1.68)
P value	0.70	0.49
Quadrant
Superior (n = 83)	0.74, 0.72 ± 0.10 (0.46–1.12)	1.45, 1.37 ± 0.2 (1.34–1.75)
Inferior (n = 83)	0.70, 0.69 ± 0.10 (0.43–1.10)	1.40, 1.35 ± 0.2 (1.20–1.67)
P value	0.04	0.02
Nasal (n = 83)	0.73, 0.72 ± 0.10 (0.46–1.12)	1.44, 1.38 ± 0.2 (1.34–1.75)
Temporal (n = 83)	0.70, 0.39 ± 0.10 (0.43–1.10)	1.40, 1.35 ± 0.2 (1.20–1.67)
P value	0.28	0.89

Abbreviation: SD, standard deviation.

Table 2 Iris Thickness (mm) Comparison by Gender, Age, Height, Eye and Quadrant [Mean, Median ± SD (Range)]

Parameter	0.8 mm From Iris Root	Mid Iris	Iris Tip
Over all iris thickness (83 eyes)	0.42, 0.41 ± 0.08 (0.29–0.65)	0.52, 0.51± 0.08 (0.31–0.73)	0.72, 0.71± 0.1 (0.42–0.93)
Gender
Female (n = 52)	0.41, 0.41 ± 0.08 (0.29–0.62)	0.51, 0.51 ± 0.08 (0.31–0.70)	0.71, 0.70 ± 0.1 (0.42–0.88)
Male (n = 28)	0.42, 0.41 ± 0.08 (0.30–0.65)	0.52, 0.51 ± 0.08 (0.32–0.73)	0.73, 0.72 ± 0.1 (0.44–0.93)
P value	0.93	0.93	0.89
Age (Year)
< 40 (n = 48)	0.42, 0.41 ± 0.08 (0.30–0.65)	0.52, 0.51 ± 0.08 (0.33–0.73)	0.72, 0.71 ± 0.1 (0.43–0.93)
> 40 (n = 35)	0.42, 0.41 ± 0.08 (0.29–0.62)	0.51, 0.51 ± 0.08 (0.31–0.70)	0.71, 0.71 ± 0.1 (0.42–0.90)
P value	1.00	0.93	0.94
Height
< 160 cm (n =49)	0.40, 0.40 ± 0.08 (0.29–0.61)	0.51, 0.50 ± 0.08 (0.31–0.70)	0.71, 0.70 ± 0.1 (0.42–0.91)
> 160 cm (n = 34)	0.42, 0.41 ± 0.08 (0.3–0.65)	0.52, 0.51 ± 0.08 (0.34–0.73)	0.73, 0.71 ± 0.1 (0.44–0.93)
P value	0.73	0.73	0.84
Eye
Right (n = 40)	0.42, 0.41± 0.08 (0.34–0.65)	0.52, 0.51 ± 0.08 (0.32–0.73)	0.72, 0.71 ± 0.1 (0.43–0.93)
Left (n = 43)	0.41, 0.41± 0.08 (0.29–0.64)	0.51, 0.51 ± 0.08 (0.31–0.72)	0.71, 0.70 ± 0.1 (0.42–0.91)
P value	0.93	0.94	0.89
Quadrant
Superior (n = 83)	0.44, 0.42 ± 0.08 (0.31–0.63)	0.54, 0.52 ± 0.08 (0.31–0.70)	0.75, 0.73 ± 0.1 (0.45–0.91)
Inferior (n = 83)	0.38, 0.37 ± 0.08 (0.29–0.62)	0.48, 0.47 ± 0.08 (0.32–0.71)	0.68, 0.67 ± 0.1 (0.42–0.89)
P value	0.046	0.044	0.017
Nasal (n = 83)	0.44, 0.42 ± 0.08 (0.31–0.65)	0.54, 0.52 ± 0.08 (0.33–0.73)	0.74, 0.72 ± 0.1 (0.48–0.93)
Temporal (n = 83)	0.41, 0.40 ± 0.08 (0.3–0.62)	0.49, 0.48 ± 0.08 (0.31–0.70)	0.70, 0.69 ± 0.1 (0.42–0.90)
P value	0.048	0.041	0.015

Abbreviation: SD, standard deviation.