Abstract
Background: The aim of the study is to introduce the acquisition of target diameter spherical aberration in term of diopter (SA-D), and to report the distribution of SA-D in patients with myopia. Methods: This was a retrospective study of patients who underwent therapeutic refractive surgery at Hangzhou MSK Eye Hospital between 10/2018 and 12/2018. The corneal Q values and apex curvature of the anterior and posterior surfaces were measured at 3.0, 4.0, 5.0, 6.0, and 7.0 mm of aperture diameters using corneal tomography. Results: In total, 531 females and 384 males were included. The anterior corneal SA-D values were: 0.39±0.19, 0.63±0.27, 0.97±0.36, 0.90±0.30, and 0.83±0.29 D at 3.0, 4.0, 5.0, 6.0, and 7.0 mm; the whole corneal values were: 0.26±0.20, 0.44±0.27, 0.70±0.36, 0.66±0.30, and 0.59±0.28 D. SE was positively correlated with anterior corneal peripheral Q-value and SA-D and whole ocular peripheral SA-D. Conclusions: Both corneal anterior and posterior Q values of myopia patients decreased while diameter increased. Both anterior and whole corneal SA-D increases significantly while diameter increases within 5mm, and both anterior and whole corneal SA-D outside 5mm decreases slightly while diameter increases. SE was positively correlated with anterior corneal peripheral Q-value and SA-D and whole ocular peripheral SA-D.
A New Pre-descemetic Corneal Ring (Neoring) in Deep Anterior Lamellar Keratoplasty for Moderate-Advanced Keratoconus: A Pilot 2-Year Long-Term Follow-Up Study
