Effect of Ocular Biometry and age on IOP Measured by Gold Man Applanation Tonometer and Pulse Air Tonometer
Rashed Almutairi, Saleh Ali Alribi
1593
ABSTRACT
Objective: To evaluate the impact of central corneal thickness, axial length,
anterior chamber depth, and corneal
curvature on Intraocular pressure (IOP) measurement
Methodology: This cross-sectional study was conducted on 56 individuals at optometry clinics at Majmaah hospital between December 2018
to March 2019. IOP measured
by Gold man applanation tonometer (GAT) and Pulse Air tonometer. Different variables were recorded for both eyes of 112 normal subjects
who came for routine ophthalmic examination.
Central Corneal Thickness (CCT), ACD & corneal curvature were measured with Pentacam, then IOP was measured with Air Pulse
Tonometer, .and subsequently IOP was measured with GAT and AL measured with A-Scan ultrasonography.
Results: The average age of all subjects were 31 years. The three groups of age
(first group 18-30 years, the second group
31-45 years, third group 46-65 years), it was noted that mean IOP was
indirectly correlated with measured both with the
pulse air and GAT in the first and third group, while it was in the direct correlation with these values in the second
group. Mean IOP for the entire population
by GAT was significantly lower (13.20 mmHg) compared with pulse air (15.5 mmHg ; P < 0.0001). Both GAT and pulse air IOP levels were
lowest for thin CCT and increased stepwise with increasing CCT. The difference between GAT and pulse air
on right eyes was largest
for thin CCT and decreased for thicker CCT (P < 0.0019
Conclusion:It was observed that IOP measurements by GAT & Pulse air tonometer
were positively correlated
with CCT & AL.
Keywords: Gold man Applanation tonometry, Air
Puff Tonometer, intraocular pressure, central corneal thickness
ABSTRACT
Objective: To evaluate the impact of central corneal thickness, axial length,
anterior chamber depth, and corneal
curvature on Intraocular pressure (IOP) measurement
Methodology: This cross-sectional study was conducted on 56 individuals at optometry clinics at Majmaah hospital between December 2018
to March 2019. IOP measured
by Gold man applanation tonometer (GAT) and Pulse Air tonometer. Different variables were recorded for both eyes of 112 normal subjects
who came for routine ophthalmic examination.
Central Corneal Thickness (CCT), ACD & corneal curvature were measured with Pentacam, then IOP was measured with Air Pulse
Tonometer, .and subsequently IOP was measured with GAT and AL measured with A-Scan ultrasonography.
Results: The average age of all subjects were 31 years. The three groups of age
(first group 18-30 years, the second group
31-45 years, third group 46-65 years), it was noted that mean IOP was
indirectly correlated with measured both with the
pulse air and GAT in the first and third group, while it was in the direct correlation with these values in the second
group. Mean IOP for the entire population
by GAT was significantly lower (13.20 mmHg) compared with pulse air (15.5 mmHg ; P < 0.0001). Both GAT and pulse air IOP levels were
lowest for thin CCT and increased stepwise with increasing CCT. The difference between GAT and pulse air
on right eyes was largest
for thin CCT and decreased for thicker CCT (P < 0.0019
Conclusion:It was observed that IOP measurements by GAT & Pulse air tonometer
were positively correlated
with CCT & AL.
Keywords: Gold man Applanation tonometry, Air
Puff Tonometer, intraocular pressure, central corneal thickness