Intraocular pressure (IOP) after cataract extraction
               surgery

Retrospective study of 101 eyes of 75 patients with medium age of 78.91 ± 7.9 submitted to cataract surgery by facoemulsification by two surgeons, without complications and with at least 6 months of follow-up. The eyes were divided in two groups: eyes with glaucoma (G) and eyes without glaucoma (NG). The IOP was evaluated with Goldmann tonometry.

Results:

51 eyes without glaucoma and 50 eyes with glaucoma. The medium IOP was 16.08 ± 3.04 before surgery, 14.69 ± 2.7 at 12 months and 14.21 ± 3.56 at 24 months. The medium value of IOP reduction before surgery to 12 months was 1.49 ± 2.98. IOP measured before surgery differed statistically from IOP at 12 and 24 months (p<0.001 e p=0.001 respectively, T. Student). Between the two groups of eyes there wasn’t a statistically significant difference in the variation of IOP (p>0.05, T Student). A model of linear regression stepwise was calculated for the variation of the IOP from before surgery to 12 months. The variables with more predictive value were IOP before surgery (R2=0.249, p=0.03) and age (R2=0.18, p=0.01).

Conclusion:

In our study cataract surgery results in IOP reduction, that is maintained at 12 months.

	CCT(μm)	SE(D)	Axial lenght (mm)	VDD (mm)	Pre-op VA	12 month VA
Total samplel	522.84±28,2	-0.77±2.86	23.2±1.17	0.56±0.26	0.21±0.16	0.74±0.25
(NG)	524.53±30,42	-0.84±2.83	23.42±1.26	0.26±0.07	0.25±0.16	0.79±0.23
(G)	520.16±24,85	-0.68±2.93	22.98±1.04	0.67±0.21	0.18±0.16	0.71±0.27
POAG	516.44±25,35	-0.24±3.07	22.96±1.07	0.69±0.21	0.21±0.16	0.71±0.26
PXC	541.5±7,78	-1.76±2.44	23.16±1.04	0.60±0.23	0.11±0.11	0.71±0.28
PACG	537	-2.56±0.64	22.54±0.7	0.77±0.16	0.18±0.19	0.45±0.35

Variable	Group	Mean	Standard deviation
Age	1	77.0741	5.58794
	2	80.6538	8.02467
	3	77.2308	13.39872
	4	81.1000	5.82046
Preoperative IOP	1	17.1926	2.14600
	2	14.9308	2.90665
	3	14.0385	2.77235
	4	18.5000	2.50555
12 month IOP	1	14.0741	2.03670
	2	14.7192	2.89165
	3	17.0769	2.69139
	4	13.2000	2.34758
24 month IOP	1	15.10	2.601
	2	14.13	3.643
	3	11.50	7.724
	4	14.60	2.966
CCT	1	524.9286	31.92651
	2	522.3125	27.11880
	3	531,5000	24.93324
	4	513.4286	34.70282
RE	1	-1.3498	2.49263
	2	-8.332	3.04475
	3	-0.6816	2.83965
	4	-0.8750	3.65230
Axial lenght	1	23.0770	1.09354
	2	23.6579	1.55722
	3	23.2215	1.16335
	4	22.7880	1.06324
xV	1	0.58	0.264
	2	0.51	0.307
	3	0.60	0.277
	4	0.60	0.173
Preoperative VA	1	0.2078	0.15240
	2	0.2142	0.15161
	3	0.2108	0.23525
	4	0.1270	0.11136
12 month VA	1	0.7720	0.27465
	2	0.7923	0.16715
	3	0.5962	0.35027
	4	0.6100	0.28848

IOP group (mmHg)	Preoperative IOP	6 month IOP	12 month IOP	24 month IOP	Change from preoperative to 6 month IOP	Change from preoperative to 12 month IOP	Change from preoperative to PIO pós 24m
32-20	21.16 ± 1.47	16.20 ± 3.27	16.80 ± 3.01	16.80 ± 2.39	-4.86 ±2.85	4.2 ± 2.66	-4.0 ± 2.66
19-18	18.23 ± 0.40	15.00 ± 2.65	15.27 ± 2.82	16.13 ± 1.89	-3.33 ±2.5	-2.86 ± 2.82	-2.08 ± 2.18
17-15	16.01 ± 0.77	14.10 ± 2.64	14.77 ± 2.67	10.67 ± 5.75	-1.95 ±2.26	-1.08 ± 2.4	-4.75 ± 5.38
14-9	12.78 ± 1.14	12.88 ± 1.89	13.10 ± 2.05	13.25 ± 2.05	0.25 ± 2.25	0.4 ± 2.08	0.17 ± 2.08

PIO Pré
Change preoperative to 12 month IOP	Pearson Correlation	0. 459
	Sig. (2-Tailed)	0. 000
Change preoperative to 24 month IOP	Pearson Correlation	0. 247
	Sig. (2-Tailed)	0. 160

		PIO pré - PIO pós 12m	PIO pré - PIO pós 24m	PIO pré - PIO pós 36m	PIO pré - PIO pós 6 m
Preoperative to	Pearson Correlation	1	0.378	0.874	0.263
12 month IOP	Sig. (2-tailed)		0.52	0.53	0.022
Preoperative to	Pearson Correlation	0.378	1	0.991"	0.216
24 month IOP	Sig. (2-tailed)	0.052		0.001	0.221
Preoperative to	Pearson Correlation	0.874	0.991"	1	0.810
36 month IOP	Sig. (2-tailed)	0.053	0.001		0.097
Preoperative to	Pearson Correlation	0.263'	0.216	0.810	1
6 month IOP	Sig. (2-tailed)	0.022	0.221	0.097
Age	Pearson Correlation	-0.005	0.507"	0.368	-0.145
	Sig. (2-tailed)	0.967	0.002	0.543	0.145
Glaucoma	Pearson Correlation	-0.076	0.021	-0.561	-0.172
	Sig. (2-tailed)	0.515	0.906	0.325	0.085
CCT	Pearson Correlation	0.090	-0.408	-1.0000"	0.039
	Sig. (2-tailed)	0.574	0.104		0.789
SE	Pearson Correlation	0.040	-0.383	-1.0000"	0.073
	Sig. (2-tailed)	0.760	0.053		0.514
Axial lenght	Pearson Correlation	0.111	0.105	0.270	0.141
	Sig. (2-tailed)	0.348	0.563	0.661	0.166
Vertical disk	Pearson Correlation	0.015	0.158	-0.414	0.141
diameter	Sig. (2-tailed)	0.933	0.646	0.488	0.712
PreoperativeAV	Pearson Correlation	0.079	0.412	0.132	-0.160
	Sig. (2-tailed)	0.500	0.491	0.187	0.109
12 month VA	Pearson Correlation	0.020	0.889'	0.022	-0.101
	Sig. (2-tailed)	0.863	0.044	0.831	0.329
DM	Pearson Correlation	-0.137		-0.170	0.141
	Sig. (2-tailed)	0.236	0.000	0.087	0.157

Sociedade Brasileira de Oftalmologia Rua São Salvador, 107 , 22231-170 Rio de Janeiro - RJ - Brasil, Tel.: (55 21) 3235-9220, Fax: (55 21) 2205-2240 - Rio de Janeiro - RJ - Brazil
E-mail: rbo@sboportal.org.br

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[1] Corresponding author: Maria Picoto, Rua Silva e Albuquerque, nº 15 Rc Dto., 1700-360 Lisboa, Portugal. E-mail: picoto.maria@gmail.com