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Original ArticleOpen Access
Comparison of Intraocular Pressure Measured by Non-Contact Air Puff versus Goldmann Applanation Tonometers in Gas-Filled Vitrectomized Eyes
Patikulsila D 
,
Taweemankongsab S ,
Ngamtipakom S
,
Taweemankongsab S ,
Ngamtipakom S DIREK PA TIKULSILA, MD*,
SRISUDA T A WEEMANKONGSAB, MD*,
SUPOB NGAMTIPAKORN, BSc*
Objective : To compare intraocular pressure (lOP) measured by two different instruments, air
puff tonometer (APT)
versus
Goldmann applanation tonometer (GAT), in gas-filled vitrectomized eyes.
Design: Three-month, prospective, comparative trial.
Participants : Thirty-eight patients (38 eyes), who underwent a pars plana vitrectomy (PPV)
with gas injection, were enrolled in the study.
Intervention: The lOP was measured by an APT, followed by GAT within 10 minutes by two
different, masked investigators.
Main outcome measures : lOPs were measured by two methods and then were compared.
Results : Overall, there was a high correlation between both measurements (r
=
0.908, p
<
0.05). Using the paired t-test, lOPs measured by the APT (21.69
เธ‘
9.28 mmHg) and GAT (22.84
เธ‘
9.84) were not significantly different (p
>
0.05). By a subgroup analysis of 17 eyes with lOP measured
by a GAT of 21 mmHg or less, the APT readings (15.28
เธ‘
4.81) and GAT readings (14.4 7
เธ‘
3.89) were
not significantly different (p > 0.05). Of 21 eyes, with lOP measured by a GAT of 22 mmHg or more, the
APT readings (26.88
เธ‘
8.81) were significantly lower than those obtained by the GAT (29.62
เธ‘
7.69) (p
<
0.05).
Conclusion : In gas-filled vitrectomized eyes, lOP measurements obtained by an APT corre-
lated well with those obtained by GAT, especially when the lOP was within normal range. However,
in eyes with elevated lOP, the APT significantly underestimated the lOP measurement when compared
to the gold standard, GAT.
Key word : Intraocular Pressure, Goldmann Applanation Tonometer, Air Puff Tonometer, Non-
Contact Tonometer
SRISUDA T A WEEMANKONGSAB, MD*,
SUPOB NGAMTIPAKORN, BSc*
Objective : To compare intraocular pressure (lOP) measured by two different instruments, air
puff tonometer (APT)
versus
Goldmann applanation tonometer (GAT), in gas-filled vitrectomized eyes.
Design: Three-month, prospective, comparative trial.
Participants : Thirty-eight patients (38 eyes), who underwent a pars plana vitrectomy (PPV)
with gas injection, were enrolled in the study.
Intervention: The lOP was measured by an APT, followed by GAT within 10 minutes by two
different, masked investigators.
Main outcome measures : lOPs were measured by two methods and then were compared.
Results : Overall, there was a high correlation between both measurements (r
=
0.908, p
<
0.05). Using the paired t-test, lOPs measured by the APT (21.69
เธ‘
9.28 mmHg) and GAT (22.84
เธ‘
9.84) were not significantly different (p
>
0.05). By a subgroup analysis of 17 eyes with lOP measured
by a GAT of 21 mmHg or less, the APT readings (15.28
เธ‘
4.81) and GAT readings (14.4 7
เธ‘
3.89) were
not significantly different (p > 0.05). Of 21 eyes, with lOP measured by a GAT of 22 mmHg or more, the
APT readings (26.88
เธ‘
8.81) were significantly lower than those obtained by the GAT (29.62
เธ‘
7.69) (p
<
0.05).
Conclusion : In gas-filled vitrectomized eyes, lOP measurements obtained by an APT corre-
lated well with those obtained by GAT, especially when the lOP was within normal range. However,
in eyes with elevated lOP, the APT significantly underestimated the lOP measurement when compared
to the gold standard, GAT.
Key word : Intraocular Pressure, Goldmann Applanation Tonometer, Air Puff Tonometer, Non-
Contact Tonometer
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