The analysis of measurement results of adult myopia biological optical parameters

Objective To investigate the correlations between the ocular biometric optical parameters and refractive dioptres in adults, assess the influence of the biometric optical parameters on the development of myopia, and provide a reference of prevention and treatment for myopia. Methods A total of 188 adults (376 eyes) aged 18 to 40 years old was enrolled in this study. Dioptres were measured with phoropter, A-mode ultrasound was used to measure the vitreous length and lens thickness, the axis length, anterior corneal surface semidiameter anterior chamber depth were measured with intraocular len-master (IOL-master). SPSS 17.0 software was used to analyze the date. Results ⑴ Of the 376 eyes, the results showed a statistically significant difference between myopia and emetropia in the axis length, vitreous depth, anterior corneal surface semidiameter, anterior chamber depth and lens thickness(P<0.01). ⑵ The partial correlation analysis indicated a significant positive correlation between the refraction dioptres and axial length, vitreous length (r=-0.90, -0.88, respectively, P<0.01); and significant strong correlation was also found between dioptres and anterior corneal surface horizontal and vertical semidiameter (r=0.81, 0.84, respectively, P<0.01); But correlations between dioptres and lens thickness and anterior chamber depth were very weak (r= -0.11, 0.12, respectively, P<0.01); the correlation between axial length and vitreous depth was very high (r=0.95, P<0.01). and the data indicated that the anterior corneal surface horizontal and vertical semidiameter were high positive correlation(r= 0.91, P<0.01); the same high positive correlation between the axial length and the anterior corneal surface semidiameter (horizontal/vertical) was also found (r= 0.78, 0.81, P<0.01). Conclusions Two chief factors (corneal surface semidiameter and ocular axial length) influencing the level of dioptres were high positive correlation, seeking the mutual coordination factors which promote corneal curvature change and axial growth and finding out the feedback mechanism of promoting the cornea sphericity might be conducive to further explore how to control the occurrence and development of myopia. Key words: Myopia/PP; Refraction, ocular; Eye/AH; Ocular physiology; Optics