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Original Research

Randomized, masked, in vitro comparison of three commercially available tear film osmometers

, , &
Pages 243-248 | Published online: 27 Jan 2017

Figures & data

Figure 1 Device A osmometer readings vs ideal dilution osmolarity.

Note: Wescor 5520 Vapro Pressure Osmometer: device A.
Figure 1 Device A osmometer readings vs ideal dilution osmolarity.

Figure 2 Device B osmometer readings vs ideal dilution osmolarity.

Note: TearLab Osmolarity System: device B.
Figure 2 Device B osmometer readings vs ideal dilution osmolarity.

Figure 3 Device C osmometer readings vs ideal dilution osmolarity.

Note: i-Med Pharma i-Pen: device C.
Figure 3 Device C osmometer readings vs ideal dilution osmolarity.

Figure 4 Device B and device C osmometers vs device A measured osmolarity.

Note: Wescor 5520 Vapro Pressure Osmometer: device A; TearLab Osmolarity System: device B; and i-Med Pharma i-Pen: device C.
Figure 4 Device B and device C osmometers vs device A measured osmolarity.

Table 1 Combined osmolarity data on contrived tear solutions for device A, device B, and device C osmometers

Figure 5 Bland–Altman plot for device B.

Note: TearLab Osmolarity System: device B.
Figure 5 Bland–Altman plot for device B.

Figure 6 Bland–Altman plot for device C.

Note: i-Med Pharma i-Pen: device C.
Figure 6 Bland–Altman plot for device C.

Figure 7 Distribution of deviation from ideal osmolarity values.

Note: TearLab Osmolarity System: device B; and i-Med Pharma i-Pen: device C.
Figure 7 Distribution of deviation from ideal osmolarity values.