Table 5.

Normative biometric values in relation to gestational age fitted to the mean. 5%, 50% and 95% confidence intervals for binocular distance (BOD), interocular distance (IOD), ocular diameter^* (OD) and volume^* by gestational age.

Gestational age (weeks)	BOD			IOD				OD		Volume
	5%	50%	95%	5%	50%	95%	5%	50%	95%	5%	50%	95%
19	25.37	28.71	32.05	10.45	12.87	15.29	7.62	8.95	10.29	−0.11	0.18	0.46
20	27.54	30.81	34.08	11.09	13.46	15.82	8.40	9.70	11.01	0.01	0.29	0.56
21	29.60	32.83	36.05	11.69	14.02	16.36	9.13	10.42	11.71	0.13	0.40	0.67
22	31.57	34.76	37.95	12.26	14.57	16.88	9.84	11.11	12.38	0.24	0.51	0.78
23	33.44	36.61	39.78	12.81	15.10	17.39	10.50	11.76	13.03	0.35	0.62	0.89
24	35.22	38.38	41.53	13.32	15.60	17.89	11.13	12.39	13.65	0.46	0.73	0.99
25	36.91	40.06	43.21	13.81	16.09	18.37	11.73	12.98	14.24	0.57	0.84	1.10
26	38.51	41.66	44.81	14.28	16.55	18.83	12.29	13.55	14.80	0.68	0.95	1.21
27	40.03	43.18	46.32	14.72	17.00	19.28	12.82	14.08	15.33	0.79	1.06	1.32
28	41.46	44.61	47.76	15.15	17.42	19.70	13.33	14.58	15.84	0.90	1.17	1.43
29	42.81	45.96	49.11	15.55	17.83	20.10	13.80	15.05	16.31	1.01	1.28	1.54
30	44.08	47.23	50.38	15.93	18.21	20.49	14.24	15.49	16.75	1.12	1.39	1.65
31	45.26	48.41	51.56	16.30	18.57	20.85	14.65	15.90	17.16	1.23	1.50	1.76
32	46.37	49.51	52.66	16.64	18.92	21.19	15.02	16.28	17.53	1.34	1.61	1.87
33	47.38	50.53	53.68	16.96	19.24	21.51	15.37	16.63	17.88	1.45	1.72	1.98
34	48.31	51.46	54.62	17.26	19.54	21.82	15.69	16.94	18.20	1.56	1.83	2.10
35	49.15	52.32	55.48	17.53	19.82	22.11	15.97	17.23	18.49	1.67	1.94	2.21
36	49.90	53.08	56.27	17.78	20.08	22.38	16.21	17.48	18.75	1.78	2.05	2.32
37	50.55	53.77	56.99	17.99	20.32	22.65	16.42	17.71	18.99	1.89	2.16	2.43
38	51.11	54.37	57.64	18.18	20.54	22.90	16.60	17.90	19.20	1.99	2.27	2.54

^*Average of left and right measurements.