[Vision Screening in Zurich].

Area of Science:

• Ophthalmology
• Public Health
• Pediatrics

Background:

• Mandatory vision screening is a key component of preventive healthcare for school children in Zurich.
• The study retrospectively analyzed vision screening data from the 2011-2012 school year in Zurich.
• School medical services conduct these essential vision screenings as part of legally mandated health check-ups.

Purpose of the Study:

• To evaluate the effectiveness of current vision screening protocols in Zurich's school system.
• To assess the prevalence of vision impairments, particularly those with amblyogenic potential, in school-aged children.
• To determine the utility of specific diagnostic tools, like the Snellen E chart and TNO stereo test, in mass screenings.

Main Methods:

• Vision screening was conducted on 7499 children across various grades.
• Mandatory screenings included first, second, and eighth graders; fourth graders had voluntary screening.
• Standard tests included monocular visual acuity using Snellen E charts and stereopsis testing with the TNO test.

Main Results:

• A significant percentage of students failed initial screenings: 55% of first graders, 11% of fourth graders, and 12.3% of eighth graders.
• Follow-up examinations by ophthalmologists revealed that 33.7% of referred children had amblyogenic potential.
• The combination of Snellen E charts and TNO stereo tests proved effective in identifying children requiring further assessment.

Conclusions:

• School-based vision screening programs, utilizing specific tests, are effective in identifying children at risk for vision disorders.
• A substantial proportion of children identified through screening possess amblyogenic factors, underscoring the need for timely ophthalmological intervention.
• The study supports the continued use and refinement of these screening methods within the school medical services framework.