Patients Seeking a Visual Impairment Certificate
For patients and families
In plain language
An automatic summary of structured registry data. It is an orientation aid, not a substitute for the official protocol or a physician assessment.
- What is being studied
- This is an observational study: the protocol does not assign a study treatment.
- Who it may be relevant to
- Registry conditions: Demographic Profiles, Impairment Certificates, Visual Impairment. Basic parameters: No limits · All.
- What needs checking
- Age, condition and sex are only basic indicators. Prior treatment, laboratory values and other mandatory requirements appear in the eligibility criteria below.
- Where it takes place
- Center list to be confirmed — check the primary protocol.
- Next step
- Save the trial, show it to the treating physician, and confirm current recruitment with the study center. Costs, documents and travel →
Unsure about the terms? Read our patient guide →
Official title
Prevalence, Causes and Demographic Profile of Patients Seeking a Visual Impairment Certificate
Overview
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.
Detailed description
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.
Primary outcome measures
- BCVA [Time frame: 1 month]
Eligibility criteria
Inclusion criteria
- Patients requesting visual impairment certificate at Assiut ophthalmology hospital having all investigations Visual field, OCT macula, VEP, ERG, US, Fundus photography Werepatients who fulfilled WHO's definition of blindness. The blind patients according to WHO's,were defined as patients 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.
Exclusion criteria
- Patients unwilling to participate in the study Incomplete or missing investigations
Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.
Healthy volunteers: No
Study design
- Observational model
- Cohort
Study locations
Center list to be confirmed — check the primary protocol.
Publications
- International Journal of Research in Medical Sciences Priya M et al. Int J Res Med Sci. 2023 Aug
- Bourne et al. (2013). Prevalence and causes of vision loss in high-income countries: a review. Lancet Global Health
Identifiers
NCT: NCT06900855 · visual impairment certificate