Refractive Status and Biometric Characteristics of Children With Familial Exudative Vitreoretinopathy.

Purpose: To compare biometric characteristics between patients with early-stage familial exudative vitreoretinopathy (FEVR) and healthy controls.

Methods: This case-control study included 50 FEVR eyes in stage 1-2 and 50 control eyes matched by age, gender and spherical equivalent (SE). Biometric parameters including axial length (AL), white-to-white diameter (WTW), central corneal thickness (CCT), anterior chamber depth (ACD), lens thickness (LT), pupil diameter, vitreous chamber depth, anterior and posterior corneal surface curvature radius (ACR and PCR), anterior lens surface curvature radius (ALR) and posterior lens surface curvature radius were measured using IOLMaster 700 and compared between cases and controls using paired t-test.

Investigation of contrast visual acuity with rigid gas permeable contact lenses after penetrating Keratoplasty.

Background: To investigate the effects of rigid gas permeable contact lens (RGP-CL) wear on contrast visual acuity in patients after penetrating keratoplasty.

Methods: Nineteen patients (19 eyes), aged 30.45 ± 5.

Study of the Biological Developmental Characteristics of the Eye in Children After Laser Surgery for the Treatment of Retinopathy of Prematurity.

Objective: To observe the differences in ocular biology between premature infants who had undergone retinal laser photocoagulation (LP) for retinopathy of prematurity (ROP) and full-term infants and to investigate the relationships between these differences and the development of the refractive state.

Methods: This retrospective, cross-sectional study included 25 children (50 eyes) who had undergone laser treatment for aggressive posterior retinopathy of prematurity (AP-ROP), ROP in zone I requiring treatment, or ROP in zone II requiring treatment in the posterior pole (laser group) and 29 full-term infants (58 eyes) who had not (control group). Basic information, spherical equivalent (SE), and best corrected visual acuity (BCVA) were collected from the two groups.

[The key parameters of design research and analysis of the Chinese reading visual acuity chart].

Objective: Reading is a visual function human being used to understand environmental events based on writing materials. This study investigated the feasibility of reading visual acuity chart in assessment of reading ability by analysis of the key factors involved in the design of the visual acuity chart.

Methods: The reading level was determined as grade 3 primary school with Song as the font and 30 characters included in the sentences.

Higher order aberrations and low contrast vision function in myopic eyes (-3.00 to -6.00 d) under mesopic conditions.

Purpose: To investigate the relationship between higher order aberrations and low contrast visual acuity in myopic eyes under mesopic conditions.

Methods: This prospective, observational case series included 52 patients (29 women, 23 men) aged 18 to 35 years. Ocular higher order aberration was measured under mesopic conditions using the Hartmann-Shack wavefront analyzer, and high (100%) and low contrast (5%, 10%, and 25%) visual acuity was measured using a multi-function visual acuity tester under the same conditions.

[Research on measurement of rigid contact lens eccentricity based on reflection].

Rigid contact lenses with eccentricity through manufacture can more or less influence visual correction or induce the corneal warpage. Therefore the fine detection of rigid contact lens eccentricity is needed and important. This study was aimed to design a system for lens eccentricity measurement by the principle of optical reflection.

[Selection of Chinese visual targets by fourier frequency spectrum analysis].

Objective: To select Chinese characters for Chinese visual acuity chart by using the method of Fourier frequency spectrum analysis.

Methods: BMP images were made for 1062 Chinese characters with small or medium number of strokes. The images were processed to derive frequency spectrum at the frequency domain by using a MatLab program.

[The relationship between corneal astigmatism with a vector-based method and whole eye second order wavefront aberrations].

Objective: To investigate the relationship between corneal astigmatism and second order wavefront aberration in myopic eyes.

Methods: The corneal astigmatism and the whole eye wavefront aberrations of both eyes of 246 subjects were measured using the Humphrey corneal topography and the WASCA wavefront analyzer. According to axial of the corneal astigmatism, the subjects were divided into five groups (WR(0), WR(180), AR, OA(45) and OA(135)).