VisionPlus Arabia

ACCOMMODATIVE FUNCTION: • Accommodative accuracy (lag or lead) - open field autorefractors, retinoscopy techniques, photorefractors and non-clinical methods such as aberrometers. • Accommodative amplitude - minus lens technique or push- up test • Accommodative facility - measured with plus/minus flippers. VERGENCE FUNCTION: • Distance and near heterophorias - Risley prism and Maddox rod, Von Graefe method, alternating cover test, Howell near phoria card, Saladin near point balance card • Near fixation disparity - Saladin near point balance card • AC/A ratio - Calculated method and gradient technique for binocular vision measurement. Equipment you need: methods for measurement of accommodation and vergence. A retinoscope, plus/minus flippers and a prism bar will cover most aspects of binocular vision assessment. CORNEAL TOPOGRAPHY Topography is crucial for safe orthokeratology fitting. Unlike myopia progression in children, astigmatism progression is rare. Studies show increases of 0.50DC DETECTING HYPEROPIA BELOW AGE- APPROPRIATE LEVELS CAN SIGNAL PRE- MYOPIA, WITH A SIGNIFICANT RISK FACTOR FOR FUTURE MYOPIA BEING A REFRACTIVE ERROR OF +0.50 OR LESS AT AGE 6-7 39 VISION PLUS ARABIA EDITION