Patients cannot be cured of trichiasis by undergoing canthoplasty. Symptoms of trichiasis generally do not improve after canthoplasty, as trichiasis is usually caused by the abnormal growth direction of the eyelashes at the edge of the eyelid towards the cornea, or by spasm of the orbicularis oculi muscle, causing the eyelid edge to roll towards the eyeball. Trichiasis can injure the corneal tissue, leading to eye congestion, redness, foreign body sensation, pain, photophobia, and tearing. For a small amount of trichiasis, the lashes can be plucked with tweezers, but this often recurs. If trichiasis recurs frequently, electrolysis treatment can be performed to destroy the follicles growing the ingrown lashes, thereby minimizing recurrence. For a large amount of trichiasis caused by entropion, surgical treatment is needed to correct the entropion for a cure.