2. In terms of oxygen permeability, the country requires the oxygen permeability of night tablets to be 90%, while ours reaches 128%, which is far higher than the national standard.

3. In terms of service life, 5-7 years, the lens is durable and not easy to break.

4. Comfort: Keshi has high wearing comfort and good correction effect.

5. Starting from the post-patching, the patch will be free within 30 days, 500 yuan/tablet for 30-60 days, and more than 90 days 1000 yuan/tablet, which is very humanized.

6. From the point of view of refund: as long as the three-month period of CTV fails to achieve the effect, it will be fully refunded.

7. From after-sales service: CTV professional all-round service is guaranteed nationwide, and children can also enjoy free service when they go to school in other places. The 24-hour service hotline will escort you.