S4Optik Hand Held Cross Cylinder is a tool used during examination for the final fine-tuning of the axis and strength of astigmatism after its determination through retinoscopy, stellate cycle or automatic refractomertry.
The handheld cross cylinders are available in ±0.25, ±0.50, ±0.75, ±1.00 and ±2.00 powers.
