Institute of Ophthalmology, Jawaharlal Nehru Medical College and Hospital, Aligarh Muslim University, Aligarh, Uttar Pradesh, India.
Indian J Ophthalmol. 2023 Jan;71(1):57-61. doi: 10.4103/ijo.IJO_1417_22.
To study the effect of pupil dilation on a biometric iris recognition (BIR) system for personal authentication and identification.
A prospective, non-randomized, single-center cohort study was conducted on patients who reported for a routine eye check-up from November 2017 to November 2019 (2 years). An iris scanning device "IRITECH-MK2120U" was used to initially enroll the undilated eyes. Baseline scans were taken after matching with the enrolled database. All eyes were topically dilated and matched again with the enrolled database. The Hamming distance (a measure of disagreement between two iris codes) and recognition status were recorded from the device output, and eyes were evaluated by slit-lamp ophthalmoscopy with special emphasis on pupil shape, size, and texture.
All 321 enrolled eyes matched after topical dilation. The pupil size had a significant effect on Hamming distance with a P value <0.05. There were no false matches. A correct recognition rate of 100% was obtained after dilation. No loss of iris texture or pupil shape was observed after dilation.
A BIR system is a reliable method for identification and personal authentication after pupil dilation. Topically dilated pupils are not a cause for non-recognition of iris scans.
研究瞳孔扩张对生物计量学虹膜识别（BIR）系统进行个人认证和识别的影响。
这是一项前瞻性、非随机、单中心队列研究，纳入了 2017 年 11 月至 2019 年 11 月（2 年）期间因常规眼科检查就诊的患者。使用虹膜扫描设备“IRITECH-MK2120U”对未散瞳的眼睛进行初始注册。在与注册数据库匹配后进行基线扫描。所有眼睛均经局部散瞳并再次与注册数据库匹配。从设备输出中记录汉明距离（两个虹膜码之间不一致的度量）和识别状态，并通过裂隙灯显微镜进行评估，特别关注瞳孔形状、大小和纹理。
所有 321 只注册的眼睛在局部散瞳后均可匹配。瞳孔大小对汉明距离有显著影响（P 值<0.05）。没有错误匹配。散瞳后可获得 100%的正确识别率。散瞳后未观察到虹膜纹理或瞳孔形状的丢失。
瞳孔扩张后的 BIR 系统是一种可靠的身份识别和个人认证方法。局部散瞳的瞳孔不会导致虹膜扫描无法识别。
