ObjectiveTo investigate whether the corneal shape recovered after discontinuation of long-term orthokeratology and whether orthokeratology increased the corneal astigmatism and ocular astigmatism.MethodsFrom December 2016 to April 2018, a retrospective study was conducted on 33 myopic patients who had undergone two times standard orthokeratology in the outpatient department of West China Hospital of Sichuan University, and had stopped wearing the first orthokeratology lens for one month before fitting the second orthokeratology lens. A total of 32 myopia frame glasses wearers were selected by simple random sampling as control. The changes of corneal flat meridian curvature (flat K), corneal steep meridian curvature (steep K), corneal astigmatism and ocular astigmatism before and after discontinuation of orthokeratology were analyzed.ResultsAmong the patients with baseline myopia diopter of −0.25～−2.75 D, the average annual change of corneal flat K was (−0.03±0.21) D in the frame glasses group and (−0.24±0.14) D in the orthokeratology group, the difference was statistically significant (t=5.555, P<0.001). Among the patients with baseline myopia diopter of −0.25～−2.75 D, the average annual change of corneal steep K was (0.20±0.42) D in the frame glasses group and (0.15±0.20) D in the orthokeratology group, the difference was not statistically significant (t=0.785, P=0.435). Among the patients with baseline myopia diopter of −3.00～−5.75 D, the average annual change of corneal steep K was (0.29±0.39) D in the frame glasses group and (−0.01±0.20) D in the orthokeratology group, the difference was statistically significant (t=2.758, P=0.014). The average changes of corneal astigmatism were analyzed according to the difference of eyes, gender, age and baseline corneal astigmatism, the difference was not statistically significant (P>0.05), respectively. For patients with baseline astigmatism absolute value less than or equal to 0.50 D, the astigmatism annual change of the frame glasses group was 0.00 (0.50) D, and that of orthokeratology group was −0.33 (0.48) D, the difference was statistically significant (Z=−2.301, P=0.021).ConclusionsThe flat K of the cornea becomes flatter and the steep K does not change after one month’s discontinuation of long-term orthokeratology. There was no difference in the increase of corneal astigmatism compared with those wearing frame glasses. When the baseline ocular astigmatism is less than or equal to 0.50 D, the increase of astigmatism may occur after discontinuation of orthokeratology.
Early onset and high incidence of myopia has caused great concern of the Party and the Government. On August 30th 2018, eight ministries and commissions, such as the Ministry of Education, jointly issued the Comprehensive Prevention and Control Implementation Scheme of Child and Adolescent Myopia, which put forward the actions and specific measures to various aspects, and particularly mentioned that the medical and health institutions should work together with families, schools, etc, to reduce the incidence of myopia. Medical institutions should do a good job in the following items: setting up visual archives for adolescents, so as to prevent and control myopia with pertinence and individualization; standardizing the process of diagnosis and treatment, doing a good job in refractive examination and correction of adolescents, and resolutely combating the commercial "treatment and correction" of myopia; strengthening myopia-related health education, and eliminating erroneous understanding to myopia prevention and control. Optometrists should play an important role in the prevention and control of myopia, speed up the cultivation of optometry talents, and call on the state to establish a professional title system and professional access standards for optometry talents as soon as possible.
【摘要】 目的 观察综合疗法治疗大龄儿童弱视的疗效。 方法 回顾分析2008年1月-2010年10月在我院初诊并经综合治疗的8～13岁弱视儿童62例85只眼的临床资料。治疗前最佳矫正视力0.1~0.7，平均0.46±0.17。观察患者经弱视综合治疗后视力、空间对比敏感度及立体视提升效果。 结果 治疗后视力正常22例31只眼（36.5%），进步29例39只眼（45.9%），无效11例15只眼（17.6%）；总有效率82.4%，与治疗前相比，差异有统计学意义（Plt;0.001）。空间对比敏感度基本正常11例16只眼（18.8%），进步43例58只眼（68.2%），无效8例11只眼（12.9%）。弱视眼在1.5、3、6三个低空间频率的对比敏感度值与治疗前相比提升有统计学意义（Plt;0.001）；在12和18两个高空间频率，对比敏感度值与治疗前相比提升无统计学意义（Pgt;0.05）。立体视锐度正常12例（19.4%），进步26例（41.9%），无效24例（38.7%），立体视锐度与治疗前相比提升具有统计学意义（Plt;0.001）。 结论 综合疗法治疗大龄儿童弱视能取得令人较为满意的疗效，患儿视力显著提升，低到中等频率空间对比敏感度及立体视锐度也有较大提升。【Abstract】 Objective To explore the therapeutic effect of comprehensive therapy on elder children with amblyopia. Methods The clinical data of 62 patients (85 eyes) with amblyopia who underwent the comprehensive therapy between January 2008 and October 2010 were retrospectively analyzed. The best-corrected visual acuity was 0.1-0.7 (mean 0.46±0.17) before the treatment. The visual acuity, spatial contrast sensitivity and stereoacuity of the patients after the treatment were observed. Results After the comprehensive therapy, the visual acuity was normal in 22 patients (31 eyes, 36.5%), improved in 29 patients (39 eyes, 45.9%), invalid in 11 patients (15 eyes, 17.6%). The total effective rate was 82.4% which was differed significantly from that before the treatment (Plt;0.001). The spatial contrast sensitivity was almost normal in 11 patients (16 eyes, 18.8%), improved in 43 patients (58 eyes, 68.2%), and invalid in 8 patients (11 eyes, 12.9%). The examination of spatial contrast sensitivity showed that the improvement was only statistically significant when frequency equates 1.5, 3, or 6 (Plt;0.001) compared with those before the treatment; while no statistically significant improvement was observed in higher frequencies of 12, 18 (Pgt;0.05). The stereoacuity was normal in 12 patients (19.4%), improved in 26 (41.9%), and invalid in 24 (38.7%); the difference in stereoacuity before and after the treatment was significant (Plt;0.001). Conclusion The therapeutic effect of comprehensive therapy is good: the visual acuity of the patients improves obviously, and the low to middle spatial contrast sensitivity and stereoacuity improve apparently.
Optometry involves knowledge from multiple fields such as biology, physics, chemistry, psychophysics, and medicine. Traditional undergraduate education in optometry mainly focuses on knowledge transmission and lacks interaction, resulting in low student interest and unsatisfactory teaching outcomes. In order to improve this situation, the teaching team of Department of Optometry and Visual Science, West China School of Medicine, Sichuan University proposed a method of integrating real visual experiences into teaching. By combining multimedia tools and existing methods, real visual phenomena and personal visual experiences are integrated into the curriculum. This new teaching method stimulates students’ interest in learning, increases classroom interaction, promotes knowledge understanding and application through vivid visual phenomena and students’ own visual experiences. This article will introduce the above teaching method.
Objective To investigate the influence of undercorrected orthokeratology on myopia control, and the correlation between target and central corneal epithelial damage. Methods A retrospective study was conducted on 22 undercorrected orthokeratology lens wearers (37 eyes) from January 2016 to February 2017, and 25 full corrected wearers (47 eyes) during the concurrent period were randomly selected as the control group. The changes of axial length before and after orthokeratology lens wearing and the within-6-month central corneal epithelial damage after orthokeratology lens wearing were analyzed. Results The average annual increase of axial length was (0.13±0.15) mm in the undercorrected group, and (0.14±0.16) mm in the full corrected group, the difference was not statistically significant (P>0.05). Multiple linear regression analysis showed that there was no correlation between the axial growth and the undercorrection of the target (P>0.05), but a negative correlation between the axial growth and the age (P<0.01). After using orthokeratology, the average annual growth of the axial length in children aged 7-10 years was (0.25±0.16) mm, and (0.10±0.14) mm in children aged 11-15 years, the difference was statistically significant (P<0.01). The incidence of central corneal epithelial punctate staining in the (–4.25)-(–5.00) D target group was 27.08%, and that in the (–3.00)-(–4.00) D target group was 16.67%, the difference was not statistically significant (P>0.05). Conclusions The effect of orthokeratology on myopia growth is not affected by the undercorrected target, not related to the undercorrection of target, but negatively correlated with the age. Undercorrected orthokeratology can still be used for myopia control in high myopia patients. No correlation is found between the target and central corneal staining.
ObjectiveTo investigate the annual average myopic growth of different-aged youngsters in recent years. MethodsBetween July 2010 and September 2011, 103 myopic youngsters (206 eyes) aged 7 to 18 years were recruited at the Ophthalmologic Department in West China Hospital. We measured their myopic diopter, and let them wear normal spectacles according to the measurement, and then measured their myopic diopter again half a year later. The difference between the two measurements was recorded and analyzed. ResultsThe male group increased (-0.82±0.44) D per year, and the female group increased (-0.99±0.57) D per year, and the difference between the two groups had statistical significance (P<0.05). The male of 7 to 10 years old increased (-0.97±0.39) D per year, and of 11 to 14 years old increased (-0.92±0.41) D per year, and of 15 to 18 years old increased (-0.49±0.37) D per year, and the differences among the three male groups had statistical significances (P<0.01). The female of 7 to 10 years old increased (-1.22±0.46) D per year, and of 11 to 14 years old increased (-0.84±0.47) D per year, and of 15 to 18 years old increased (-0.61±0.67) D per year, and the differences had statistical significances (P<0.01). ConclusionThe annual myopic growth of youngsters is related with age and sex. The growth of the female is faster than the male, and the younger also grows faster.
The aim of this study was to investigate the feasibility of anterior segment optical coherence tomography to assess the anterior segment morphology of hyperopia in school-aged children. 320 eyes of 160 school-aged children, 6-12 years of age, were examined with anterior segment optical coherence tomography and were divided into four groups according to the cycloplegic spherical equivalence of refractive error. The mentioned four groups were: emmetropia group, low hyperopia group, moderate hyperopia group and high hyperopia group. The measurements of central corneal thickness, anterior chamber depth, angle opening distance, trabecular iris space area and scleral angle were compared in pairs among objects in the four groups. The results showed that high hyperopia and moderate hyperopia had shallower anterior chamber depth and narrower anterior chamber angle compared to those in emmetropia group. The study also showed that anterior segment optical coherence tomography as a non-contact technology could become a new technology for accessing the anterior segment morphology of hyperopia in school-aged children.