An observational study in Demographic Profiles, Impairment Certificates and Visual Impairment, sponsored by Assiut University. Not yet recruiting. Per ClinicalTrials.gov, last updated 2025-03-28.
Sponsored by Assiut University · Observational
This study investigates the prevalence, causes, and demographic characteristics of patients seeking visual impairment certificates at Assiut Ophthalmology Hospital. Using a prospective cross-sectional design, it aims to identify the magnitude and nature of visual impairment in this population by analyzing clinical data, performing comprehensive eye examinations, and utilizing advanced diagnostic tools.
The study is designed to explore the prevalence, underlying causes, and demographic profiles of patients requesting visual impairment certificates at Assiut Ophthalmology Hospital. It employs a prospective cross-sectional approach, recruiting patients from ophthalmology outpatient clinics who meet the World Health Organization's (WHO) definition of blindness. Blindness is defined as having best-corrected distance visual acuity (BCVA) of 3/60 or less in the better eye or a visual field restricted to 10° or less in the widest diameter of vision.
Eligible participants undergo comprehensive eye examinations, including visual acuity measurement using Snellen charts, slit-lamp biomicroscopy, dilated fundus examination, and automated perimetry for visual field assessment. Advanced investigations such as OCT macula imaging, VEP (visual evoked potential), ERG (electroretinography), ultrasound, and fundus photography are performed to identify the causes of visual impairment. Demographic data-such as age, sex, marital status, occupation, socioeconomic status, education level-and systemic medical history are collected to assess contributing factors.
The sample size was calculated using Epi-info software with a confidence level of 95% and confidence limits of 5%, estimating a minimum of 383 cases. By analyzing clinical findings alongside demographic characteristics, the study aims to provide valuable insights into the magnitude and nature of visual impairment in this specific population. This information could help inform public health strategies and improve services for visually impaired individuals.
Participants undergo comprehensive eye examinations, including visual acuity measurement using Snellen charts, slit-lamp biomicroscopy, dilated fundus examination, and automated perimetry for visual field assessment. Advanced investigations such as OCT macula imaging, VEP (visual evoked potential), ERG (electroretinography), ultrasound, and fundus photography are performed to identify the causes of visual impairment. Demographic data-such as age, sex, marital status, occupation, socioeconomic status, education level-and systemic medical history are collected to assess contributing factors.
Exclusion Criteria:
The study population consists of patients requesting visual impairment certificates at Assiut Ophthalmology Hospital, who have undergone all required investigations, including visual field testing, OCT macula imaging, VEP, ERG, ultrasound, and fundus photography. Eligible participants are those fulfilling WHO's definition of blindness, defined as having best-corrected distance visual acuity (BCVA) of 3/60 or less in the better eye or a visual field restricted to 10° or less in the widest diameter of vision. Excluded are patients unwilling to participate or with incomplete/missing investigations. A calculated sample size of 383 cases ensures statistical reliability. Demographic and clinical data such as age, sex, occupation, socioeconomic status, marital status, education level, and associated systemic conditions are collected alongside comprehensive eye examinations.
BCVA
BCVA of 3/60 or less in the better eye visual field restricted to 10 or less in the widest diameter of vision.
Time frame: 1 month
No study locations are listed for this record.
Plan to share: No
This study is not yet recruiting, as verified in Mar 2025. You cannot join it, but the record below documents what was studied.
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Assiut University