on the trail/track of (someone or something)
seeking someone or something
The police dogs were on the trail of the bank robber.
Precaution while using Contact Lenses
Dailywear lenses should never be worn as extendedwear lenses. Misuse can lead to temporary and potentially sight threatening damage to the cornea. People who wear any type of lens overnight have a greater chance of developing infections of the cornea. These infections are often due to poor cleaning and lens care. Improper over wearing of contact lenses can result in intolerance, leading to the inability to wear contact lenses.