A significant portion of the Czech adult population – roughly one in two – relies on glasses or contact lenses, with at least one million new prescriptions filled annually. However, many users report worsened vision *because* of their corrective lenses. While opticians typically correct their own errors free of charge, patients face difficulties when inaccurate measurements are made by doctors who then refuse to acknowledge the mistake. This leaves patients with ineffective prescriptions and diminished eyesight. Some ophthalmologists are now surprisingly advising patients to seek vision tests from optometrists instead of relying solely on traditional eye doctors, suggesting a potential gap in quality control within the medical system. The situation highlights a concerning issue of accountability and accuracy in vision care within the Czech Republic.