[Clinical effects of two different hydroxyapatite bone graft materials during maxillary sinus lifting surgery with bone grafting and simultaneous implantation of implants].

Purpose: To compare the clinical effects of two different hydroxyapatite bone graft materials in maxillary sinus lifting surgery with bone grafting and implantation at the same time.

Methods: Seventy-two patients with implantation in the maxillary posterior dental area and insufficient bone mass admitted to the First Affiliated Hospital of Bengbu Medical College were collected from March 2018 to April 2019, and they were divided into experimental group(n=36) and control group(n=36) by random number table. Patients in the control group used hydroxyapatite composite material, while patients in the experimental group used nano-hydroxyapatite composite material.

[Correlation between quantitative nerve fiber layer thickness and mean defect of visual field in primary open angle glaucoma].

Objective: To establish whether the structural parameters provided by GDx can be used to reflect functional damage in the mean defect of visual field.

Methods: 97 (191 eyes) patients with primary open angle glaucoma underwent examination with GDx and Octopus 1-2-3 automatic perimeter. The relationship between the retinal nerve fiber layer parameters and mean defect of visual field was analysed by ANOVA, Pearson's correlation(r), scatter plot and linear regression.

Frequency-doubling threshold perimetry in predicting glaucoma in a population-based study: The Beijing Eye Study.

Objective: To determine the predictive value of frequency-doubling threshold perimetry for glaucoma in a population-based study.

Methods: The Beijing Eye Study, a population-based study on subjects 40 years or older, included an ophthalmic examination with fundus photography and frequency-doubling threshold perimetry. Glaucoma was defined by a glaucomatous optic disc appearance.

[Single channel multifocal VEP studies in normal Chinese].

Objective: To investigate the waveform characters of single channel mVEP and its variability in normal Chinese people.

Methods: VERIS Science 4.3 system was used to record and analyze single channel mVEP.

[The value of frequency doubling perimetry in glaucoma screening of aged 40 or more population].

Objective: To investigate the diagnosis value of the frequency doubling perimetry (FDP) screening program in the aged 40 or more natural population-based glaucoma screening.

Methods: In 3 natural villages of Daxing District and 4 northern metropolitan communities of Beijing, 4439 subjects aged 40 or over were screened for glaucoma from May to October in 2001. The screening protocol C-20-1 of the frequency doubling perimetry (FDP) was used in all subjects.

[The prevalence and its screening methods of primary open angle glaucoma in defined population-based study of rural and urban in Beijing].

Objective: The purpose of the study is to determine the prevalence of primary open-angle glaucoma (POAG) in persons aged 40 or above in Beijing, China.

Methods: From June 2001 to October 2001, the screening population was identified by a door-to-door census in five metropolitan resident areas in the north of Beijing and three villages in a county south to Beijing. The screening included visual acuity, frequency doubling perimetry (FDP, C-20 screening program), non-contact tonometry, slit lamp microscopy, anterior chamber depth (Van Herick method), and fundus photography.

[Prevalence of low vision and blindness in defined populations in rural and urban areas in Beijing].

Objective: To investigate the prevalence and causes of low vision and blindness in Beijing residents aged 40 and over.

Methods: 4,451 residents aged 40 and over in 3 rural communities and 5 urban communities in Beijing underwent eye examination, including examination of distant and near visual acuity (VA), best corrected distant and near VA, pinhole VA, and visual field, slit lamp biomicroscopy, and dilated ocular examination in the form of in-home survey by defined population-based sampling. The medical history was surveyed too.