Step 1: Understanding the Concept:
Shatkarmas are the six purification techniques in Hatha Yoga.
Step 2: Detailed Explanation:
- Trataka: It is the practice of steady gazing at a particular point or object (like a candle flame) without blinking. It is known to strengthen the eye muscles, improve vision, and increase concentration and mental calm.
- Sheetali: A cooling pranayama (breathing technique).
- Neti: A cleansing process for the nasal passages.
- Kapalbhati: A breathing technique for skull-shining and blood purification.
Step 3: Final Answer:
Trataka is the Kriya that improves eyesight and calms the mind.