Ocular surface squamous neoplasia (OSSN) is the most common tumor of the ocular surface, including squamous cell papilloma, actinic keratosis, conjunctival intraepithelial neoplasia and squamous cell carcinoma. The extended understanding of clinicopathological features could help improve clinical accurate diagnosis of these lesions. This article reviews the classification, clinical features and pathological characteristics of OSSN to provide the reference for clinical diagnosis and treatment.

Ophthalmic pathology is an important branch of histopathology. As a bridge and link between basic medicine and clinical medicine, ophthalmic pathology plays an important role in understanding and revealing the characteristics of ocular diseases. The previous generations have laid a solid foundation for ophthalmic pathology with their hard work. Moreover, the advancement of ophthalmic clinical technology and systematic pathology in recent years have further facilitated the development of ophthalmic pathology. The comprehensive combination and in-depth application of cell biology and molecular biology have promoted and expanded the research field of ophthalmic pathology. In addition, new progress has been witnessed in the field of clinical pathology and experimental pathology constantly. Under the new situation, the development of ophthalmic pathology is faced with both opportunities and challenges.

Objective: To evaluate the application value of empowerment education mode in health education for patients with dry eye syndrome. Methods: Patients with dry eye syndrome were recruited from Department of Ophthalmology, Zhujiang Hospital, Southern Medical University from June 2017 to December 2017. All patients were randomly divided into the experimental group (n=73), educated with empowerment education mode, and control group (n=73), treated with traditional health education. Patients were followed up after 1 week, 1 month, 2 months and 6 months, respectively. Data were collected in each follow-up visit including ocular surface disease index (OSDI), tear film break up time (BUT), the frequency of home care (cleaning eyelid margin, hot compress, palpebral gland massage) and re-visit frequency. Results: The OSDI and BUT were similar between two groups before corresponding treatment (P>0.05). After the treatment, patients in the experimental group showed a downtrend in the OSDI and uptrend in the BUT. No significant changes were found in the control group during the follow-up. The frequency of family nursing and re-visit in the experimental group was statistically higher than that in the control group. Conclusion: The application of empowering education mode can improve the compliance of dry eye patients, improve the frequency of home care and follow-up visit, and mitigate the ocular surface of patients, thereby enhancing the long-term efficacy.

Objective: To evaluate the effect of intraocular pressure (IOP) on corneal endothelial cells after silicone oil tamponade. Methods: Patients (n=131) received vitrectomy with silicone oil injection in Ophthalmology Center in Second People’s Hospital of Foshan City from January 1st to September 30th 2019 were divided into the high IOP group (n=80) and normal IOP group (n=51). IOP was >21 mmHg at any time in the high IOP group and was ≤21mmHg in the normal IOP group after surgery. The values of corneal endothelial cells before filling with silicone oil and before removing silicone oil were compared. Results: The average IOP was 20.79 mmHg in the high IOP group, and 14.70 mmHg in the normal IOP group (P<0.001). The number of endothelial cells (ECD) was reduced, but the average endothelial cell area was increased (P<0.05) in both groups. The coefficient of variation of endothelial cell size in high IOP group was increased (P<0.05). ECD loss rate was 6.3% in the high IOP group and 3.5% in normal IOP group. Increased IOP within 1–6 weeks after surgery (7.1%) and IOP ≥40 mmHg (7.3%) had the greatest impact on ECD. ECD loss was correlated with IOP (r=0.176, P=0.044). Conclusion: High intraocular pressure after silicone oil filling is an important risk factor for the loss of corneal endothelial cells.

Objective: To investigate the influencing factors of compliance of patients with silicone oil tamponade after vitrectomy. Methods: A total of 100 patients with silicone oil tamponade after vitrectomy in Wuxi People’s Hospital of Jiangsu Province from January 2018 to December 2019 were selected by random sampling method. The general information, possible reaction, and compliance of face-down positioning (FDP) were investigated by questionnaire. SPSS 19.0 was used for statistical analysis. Results: There were significant differences in patients’ gender, attention to disease and FDP compliance (P<0.05), but there was no significant difference between family support system and FDP (P>0.05). The main influencing factors of FDP compliance were dyspnea (84%), poor sleep (78%), the discomfort of shoulder and neck (10%); on the third day after operation, the main influencing factors were dyspnea (66%), low back pain (50%) and poor sleep (39%); on the fifth day, the main influencing factors were numbness of the limbs (70%), low back pain (87%) and poor sleep (30%), the discomfort of shoulder and neck (18%) and elbow pain (10%). Conclusion: The main factors that affect the compliance of patients are gender, self-awareness of the disease and discomfort caused by FDP. It is necessary to strengthen the identification of high-risk factors, and give symptomatic education and guidance at different stages of illness, to improve the compliance of patients to FDP.

Objective: To analyze the demographic characteristics and biochemical indexes of type 2 diabetic patients in Han population in Hunan, and to find the high-risk factors of diabetic retinopathy. Methods: The data of demographic characteristics and biochemical indexes of normal population, type 2 diabetic patients but without retinopathy and type 2 diabetic retinopathy in Hunan were analyzed. Group t test and logistic regression analysis were used to analyze the susceptibility factors of diabetic retinopathy. All the subjects were Han population. Results: There were no significant differences in gender distribution, age distribution, BMI, diastolic blood pressure, HbA1c, total cholesterol, high-density lipoprotein, uric acid and total bilirubin between the control group [non-diabetes mellitus (NDM) group] and the type 2 diabetic without retinopathy group [non-diabetic retinopathy (NDR) group] (all P>0.05). The abdominal circumference, systolic blood pressure, fasting blood glucose, triglyceride, creatinine and low-density lipoprotein in NDM group were all lower than those in NDR group, and the differences were statistically significant (all P<0.05). BMI, abdominal circumference, systolic blood pressure, diastolic blood pressure, fasting blood glucose, HbA1c, total cholesterol, triglyceride, creatinine and LDL in NDM group were all lower than those in type 2 diabetic retinopathy (DR) group, and the differences were statistically significant (all P<0.05). The comparison between the NDR group and the DR group showed that the values of systolic blood pressure, diastolic blood pressure, HbA1c, total cholesterol, triglyceride and creatinine in the NDR group were all lower than those in the DR group, and the differences were statistically significant (all P<0.05). Conclusion: SBP ≥150 mmHg, DBP ≥90 mmHg, HbA1c ≥9%, serum creatinine ≥100 μmol/L, triglyceride ≥3 mmol/L are the high-risk factors of diabetic retinopathy.

Objective: To compare the consistency of Kappa Angle measurements in patients with age-related cataracts using four instruments of different principles in a dark room. Methods: Sixty cases (60 eyes) of age-related cataract were adapted in the darkroom for 10 minutes. The pupil size and angle Kappa were measured by iTrace, Pentacam HR, Lenstar900 and IOLMaster700. One-way ANOVA test and Kruskal-Wallis nonparametric test were used to compare the measured data among the four instruments, and Bland-Altman analysis was used for consistency comparison. Results: The measured pupil diameters of iTrace, Pentacam HR, Lenstar900 and IOLmaster700 were 4.64±0.71 mm, 2.96±0.47 mm, 4.86±0.76 mm and 4.66±0.92 mm. The Angle Kappa sizes were 0.227±0.121 mm, 0.161± 0.09 mm, 0.2±0.124 mm, 0.203±0.104 mm. The proportion of angle Kappa larger than 0.5 mm was 3.33%, 3.33%, 1.67% and 1.67%. The measurement results of angle Kappa between Pentacam and iTrace were statistically significant (P=0.001). There was no significant difference in the measurement results of angle Kappa between Pentacam and Lenstar900, Pentacam HR and IOL-Master700 (P=0.044, 0.036). There was no significant difference in the results of angle Kappa measurement among the other three instruments. The subjective score of light intensity in the process of measurement of iTrace, Pentacam HR, Lenstar900 and IOLMaster700 showed that during the process of measurement, 60 cases (100%) experienced obvious discomfort caused by the light intensity in Pentacam HR, while 40 cases (66.67%) felt comfort in IOLMaster700. The differences among the subjective score of light intensity of four instruments were statistically significant (P<0.001). Conclusion: The consistency of the measurement results of Kappa angle between Pentacam HR and iTrace, Lenstar900, IOLMaster700 in the darkroom is relatively poor, so it is necessary to be careful to replace them in clinic.

Objective: To observe the effectiveness and safety of orthokeratology lens and toric design othokeratology treatment for compound myopic astigmatism. Methods: From March 2016 to March 2018, 94 teenagers (178 eyes) were selected as the subjects of study. They were divided into two groups according to the type of orthokeratology: the orthokeratology lens group (48 cases, 90 eyes) and the toric design othokeratology group (46 cases, 88 eyes). Visual acuity, corneal astigmatism, axial length, spherical lens refraction, intraocular pressure, tear film rupture time and corneal staining rate were recorded before, after 1 year and after 1 week. Results: After 1 year of wearing the lens, astigmatism, spherical lens degree, intraocular pressure and tear film rupture time were all decreased in the 2 groups compared with each other, but only astigmatism degree was statistically significant between the 2 groups compared with each other (P<0.01). After wearing the glasses for 1 year, the visual acuity of the two groups was significantly improved compared with that before wearing the glasses, and the myopia degree was increased after stopping wearing the glasses compared with that before wearing the glasses, but the difference between the two groups was not statistically significant (P>0.05). There was no statistical significance in the incidence of corneal staining between the two types of shaping lenses (P>0.05). Conclusion: Both of the two shaping lenses can reduce the degree of myopic patients with complex astigmatism and effectively improve the visual acuity of patients, but they can not completely prevent the progress of myopia. Although toroidal shaping mirror has advantages in correcting astigmatism, its overall effectiveness and safety are not.

Optical coherence tomography angiography (OCTA) is a noncontact, noninvasive, and rapid angiography technique. It provides vascular images by detecting changes in the optical coherence tomography (OCT) signal of red blood cells in the blood vessel. Since this technique does not require injection of angiography, it is safer than traditional ophthalmic angiography. In the examination of anterior segment diseases, OCTA can not only quantify the range and density of anterior segment blood vessels, but also shows good imaging quality, providing an objective evaluation for clinical monitoring of the disease course and response to treatment.

Clustered regularly interspaced short palindromic repeats (CRISPR) genome editing is a newly developed technology to precisely modify cellular DNA sequence, which could control cell fate and phenotype and fundamentally reform disease treatment. The structure of the eye offers unique advantages as a genome editing target. Recently, a CRISPR genome editing therapy has begun to be tested in Leber congenital amaurosis 10 (LCA10) patients, and the clinical trials for more ocular diseases are about to start. The development of CRISPR/Cas genome editing tools will drive major advances in the application of gene therapies in the treatment of ophthalmic disease.