Abstract
Purpose :
The purpose of this study was to compare different methods of pupil diameter(PD) measurement using Lenstar LS 900 (Haag-Streit AG) , OA-2000 (Tomey, Japan)，iTrace (ray-tracing; Tracey Technologies, Houston, TX) and OPD-Scan III (NIDEK, Inc., Fremont, CA) and analysis the pupil diameter changes of cataract patients.
Methods :
Prospective, instrument reliability analysis.To analyze PD of 267 eyes from 148 age-related-cataract patients in our hospital from Jan to Sep in 2017. Patients were divided into 3 groups: group 1 age≤60y（78 eyes），group 2 60y<y≤70y（95 eyes）, group 3 age>70y（94 eyes）. The measurement of photopic PD was performed by OA-2000, Lenstar LS 900 and scotopic PD measurement was performed by iTrace and OPD Scan-III before operation. Statistical analysis of data using SPSS 23.0 software.
Results :
The mean values of photopic PD measurement used by Lenstar LS 900，OA-2000 and OPD Scan-III were (4.18±1.03)mm, (4.55±0.88)mm and (3.84±0.67)mm in the group 1; (4.19±1.05)mm, (4.72±1.20)mm and (3.87±1.32)mm in the group 2, (3.70±1.04)mm, (4.08±0.87)mm and (3.70±0.74)mm in the group 3. There were significant differences of photopic PD measurement using the 3 methods in group 1 and group 2(p<0.05). The mean values of scotopic PD measurement used by OPD Scan-III and iTrace were (5.19±0.90)mm and (4.87±0.82)mm in the group 1; (5.03±1.04)mm and (4.74±0.74)mm in the group 2, (4.54±0.80)mm and (4.35±0.75)mm in the group 3. There were no statically differences of scotopic PD measurement using the 2 methods in each group. Comparison in photopic PD at different age: group 2 was larger than group 1, with statistical differences (P<0.05), and group 3 showed a significant decrease, with statistical differences (P<0.05).
Conclusions :
There were significant differences of photopic PD measurements in age-related cataract patents(age<70y) among Lenstar LS 900，OA-2000 and OPD Scan-III. OPD Scan-III and iTrace showed no statically difference for scotopic PD measurement in age-related cataract patents. The photopic PD of 3 technologies had a tendency to change in different age stage, which were decreased correspondingly with age more than 70 years old.
This abstract was presented at the 2019 ARVO Annual Meeting, held in Vancouver, Canada, April 28 - May 2, 2019.