Contact Lenses and Comfort | 合法醫療器材資訊網

2017年5月15日—In2013,AlconlaunchedDailiesTotal1(delefilconA),aone-daySiHycontactlenswithwhat'sdescribedbythemanufactureras'watergradient ...

Influenced by clinical feedback that discomfort is the number one cause of dropout, the latest contact lenses have evolved significantly to improve ocular comfort. This is especially true with silicone hydrogel (SiHy) contact lenses, which are supplanting soft hydrogel lenses in popularity. Whereas first-generation SiHy contact lenses emphasized higher oxygenation for extended wear, newer materials have improved comfort without sacrificing the high oxygen permeability of silicone.1 

Researchers have been trying to improve comfort by increasing water content, decreasing the modulus, lowering contact angle hysteresis and adding surface coatings and plasma treatments. One study found that over a 10-year period, the water content of SiHy contact lenses has increased from 24% to 74%, and the modulus has decreased significantly from 1.4MPa to 0.3MPa.2 Increased contact lens water content and surface ...