World 4 · Exam & Deep Optics · 8 min · PROEye Clinic
Axial length, dioptres, and a prescription
PRO · Light & Optics
World 4: Exam & Deep Optics is part of PRO
The first world of Light & Optics is free. PRO opens the other 43 lessons in 5 worlds — simulations, quizzes and all.
PRO includes
- All 26 labs — every world, every lesson
- Practice exams and certificates
$8.33/mo, billed yearly ($99.99) · or $39.99 monthly