Effects of Hard Contact Lenses on the Chilride Ion of the Tears

Key Points

• To examine how hard contact lenses affect chloride ion levels in tears during the adaptation period.
• Monitored chloride ion levels in tears before, during, and after hard contact lens fitting.
• Compared levels to population averages for chloride ions.
• Evaluated correlation between patient symptoms and responses during adaptation.
• Chloride ion stability in tears showed noticeable changes during adaptation to hard contact lenses.
• Significant variations were observed in patient symptom reporting corresponding to ion level changes.
• Average chloride ion levels differed from expected population norms after fitting.