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A Method of Human Eye Parameter Measurement Based on Laser Self-Mixing Interference
摘要： The eye is the most important sensory organ of the human body, and the cornea and anterior chamber are very important components In surgeries like vision correction, it is necessary to know the accurate corneal thickness and anterior chamber depth of human eyes. Their accurate measurement cannot only provide a reference for doctors, but also provide a strong guarantee of surgical results. In order to achieve high-precision measurements of human corneal thickness and anterior chamber depth, we develop an equivalent human-eye optical system and a measurement method for the thickness. This method designs an equivalent double-membrane system to simplify the physiological structure of the cornea and anterior chamber of the human eye and irradiate the double-membrane system through laser. The re?ected light returns to the laser cavity and the original light self-mixing interference, and a photodetector collects and processes the interference signals to obtain the corneal thickness and anterior chamber depth. The correctness of the theoretical calculations is veri?ed by the experimental system, and the measurement accuracy can reach the micrometer level.
关键词： self-mixing interference,anterior chamber depth,corneal thickness,confirmatory experiment,double-membrane system
更新于2025-09-23 15:21:01
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Comparison of Anterior Segment Measurements between Scheimpflug Camera and New Module of Optical Coherence Tomography
摘要： Purpose: We compared the anterior segment measurements using a Scheimpflug camera (Pentacam? [Oculus Inc., Wetzlar, Germany]) and a new anterior segment module of optical coherence tomography (Cirrus HD-OCT 5000? [Carl Zeiss Meditec, Dublin, CA, USA]). Methods: Anterior segment measurements were evaluated in 47 eyes of 26 patients who visited for the purpose of cataract surgery. Measurements of the central corneal thickness (CCT), anterior chamber depth (ACD), anterior chamber angle (ACA; nasal and temporal side), and angle to angle distance (ATA) were compared between the Pentacam? and the new anterior segment module of the Cirrus HD-OCT 5000?. Results: The mean CCTs measured by the Pentacam? and the new anterior segment module of the Cirrus HD-OCT 5000? were 561.68 ± 31.35 μm and 559.04 ± 36.43 μm, respectively. There was no statistically significant difference (p = 0.387) and high correlations in the results using the two methods (r = 0.824, p < 0.001). The mean ACD measurements using the Pentacam? and Cirrus HD-OCT 5000? were 2.70 ± 0.44 mm and 2.68 ± 0.42 mm, respectively. The measurements were strongly correlated (r = 0.981, p < 0.001) without a statistically significant difference (p = 0.091). The measurements of ACA (nasal and temporal side) and ATA did not differ significantly different between the two methods (p = 0.109, p = 0.153, p = 0.322, respectively). High correlations were observed between the two methods (r = 0.944, r = 0.951, r = 0.955, respectively; p < 0.001 in all groups). Conclusions: There was no significant difference between the CCT, ACD, ACA, and ATA measured by the Pentacam? and the new anterior segment module of the Cirrus HD-OCT 5000? in adult patients. However, there was a low degree of agreement for the CCT. The measurements of ACD, ACA, and ATA can therefore be considered interchangeable when used clinically.
关键词： Pentacam?,Anterior chamber depth,Cirrus HD-OCT?,Anterior chamber angle,Central corneal thickness
更新于2025-09-09 09:28:46