INTRAOCULAR PRESSURE MEASUREMENTS IN STANDING, SITTING, PRONE, AND SUPINE POSITIONS
Published 2025 - 29th ESCRS Winter Meeting
Reference: PO177 | Type: Free Paper | DOI: 10.82333/v0b9-ww19
Authors: Ferdinando Cione* 1 , Maddalena De Bernardo 1 , Sergio Pagliarulo 2 , Isabella Pellegrino 1 , Francesco Maria Capuano 1 , Marco Gioia 3 , Nicola Rosa 1
1Eye Unit, Department of Medicine, Surgery and Dentistry "Scuola Medica Salernitana",University of Salerno,Salerno,Italy, 2Eye Unit,PO San Luca,Vallo della Lucania,Italy, 3Eye Unit,PO Maria SS Addolorata,Eboli,Italy
Purpose
Body position can play a major role in intraocular pressure (IOP) changes. It is well known that IOP may rise significantly when in supine position, but prolonged standing position was not well studied. On these bases, this study aims to evaluate IOP measurements performed with Tono-Pen AVIA (TPA), an applanation-based tonometer after 5 min or more in standing and prone positions.
Setting
University Eye Clinic, Department of Medicine and Surgery, University of Salerno, Italy.
Methods
IOP was measured in sitting, supine, prone, and standing (ST) positions and again five minutes after standing (ST-5) utilizing a Tono-Pen AVIA in 124 eyes of 62 healthy subjects with ages ranging from 21 to 59 years (mean 30 ± 10 years). In each subject, the average IOP of both eyes was analyzed using the paired Student’s t-test and correlations analyses were performed with Pearson’s test. A p-value less than 0.05 was considered statistically significant.
Results
The mean IOP difference between the ST and sitting positions was −0.13 ± 1.63 mmHg (p = 0.548); between ST-5 and sitting, it was 0.53 ± 1.24 mmHg (p = 0.001); between supine and sitting, it was 1.30 ± 1.48 mmHg (p < 0.001); between ST and supine, it was −1.43 ± 1.74 mmHg (p < 0.001); between ST-5 and supine, it was −0.77 ± 1.59 mmHg (p < 0.001); between prone and supine, it was 2.24 ± 1.92 mmHg (p < 0.001); between ST and ST-5, it was −0.67 ± 1.84 mmHg (range: −7.5 to 5 mmHg) (p = 0.007); between prone and ST, it was 3.46 ± 2.01 mmHg (p < 0.001); between ST-5 and prone, it was −2.46 ± 1.67 mmHg (p < 0.001); and between sitting and prone, it was −3.22 ± 1.56 mmHg (p < 0.001).
Conclusion
The results of this study confirm the importance of measuring IOP in supine position, but more importantly suggest a significant IOP increase in the ST-5 position, suggesting that such measurements need to be performed in an attempt to explain the progression of glaucoma in apparently normal-tension patients.