Young children are at greater risk for ocular chemical burns in comparison to adults. In 1- to 2-year-old children, household cleaners are most often to blame for ocular chemical injury. In fact, 1-year-olds are twice as likely to suffer chemical eye burns in comparison to 24-year-olds (Haring et al, 2016).
The typical symptoms after chemical injury are sudden onset pain, epiphora, and blepharospasm. Basic substances penetrate the eye more rapidly in comparison to acids. Chemical injury may also penetrate the anterior chamber and damage the trabecular meshwork, ciliary body, and the lens. This process is very rapid and can cause irreversible damage in five to 15 minutes (Fish and Davidson, 2010; Singh et al, 2013; Eslani et al, 2014).
After a thorough irrigation of the eye, the initial evaluation includes a complete eye examination. Clinical manifestations after chemical injury vary and can change over time. Acute periocular signs of injury include periorbital edema and erythema, loss of epithelium of the skin, and loss of eyelashes and eyebrows. Conjunctival and corneal epithelial defects, chemosis, conjunctival inflammation, limbal ischemia, corneal cloudiness, sterile ulceration, edema, and perforation also may occur.
High intraocular pressure may result from damage to, and inflammation of, the trabecular meshwork. Extensive damage to the limbus may lead to limbal stem cell deficiency, causing loss of normal epithelial corneal healing, neovascularization, and conjunctivalization of the cornea. Conjunctival inflammation may lead to lagophthalmos, symblepharon formation, cicatricial entropion and ectropion, and trichiasis (Fish and Davidson, 2010; Singh et al, 2013; Eslani et al, 2014).
Ocular chemical injury may ultimately result in corneal opacification. The irregular astigmatism from the corneal scar can be visually addressed with GP contact lenses or a corneal transplantation. The disadvantages of keratoplasty, especially in pediatric patients, include risks of examination under anesthesia, higher incidence of graft rejection and graft failure, suture-related astigmatism, and higher cost.
Consider a 6-year-old male diagnosed with amblyopia from a large corneal scar in his left eye due to a chlorhexidine chemical burn acquired at 4 years of age. Due to increased risks in children, corneal transplantation was deferred by his parents. Thus, this patient was managed conservatively with occlusion therapy and a scleral contact lens to correct his irregular astigmatism (Figure 1). This young patient was able to apply and remove the contact lens completely by himself (Figure 2). With this management, the patient’s vision improved from 20/200 to 20/60. CLS
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