A client presents to the emergency department with a chemical burn to the right eye from a household cleaning product containing sodium hydroxide. The client is experiencing severe eye pain, tearing, and blurred vision. What is the nurse's highest priority action?

Immediate irrigation is critical for chemical eye burns, especially alkaline ones like sodium hydroxide, to dilute and remove the substance and prevent further tissue damage. Other actions like patching, pain relief, or history-taking are secondary priorities.

Understanding the Priority: Chemical Ocular Burn
When a chemical substance, especially an alkali like sodium hydroxide, contacts the eye, it triggers a rapid and destructive process known as liquefactive necrosis. Unlike acids, which create a barrier of coagulated proteins, alkalis saponify the fatty acids in cell membranes and rapidly penetrate deep into the ocular tissues. This penetration can damage the corneal stroma, anterior chamber structures, and even the retina within seconds to minutes. The severity of the injury is directly correlated with the duration of contact between the chemical and the ocular surface. Therefore, the single most critical factor in determining the patient's visual prognosis is the speed at which the chemical is diluted and removed.

Analysis of the Correct Answer
Option 4: Begin immediate and continuous irrigation of the affected eye with normal saline is the highest priority action. Current evidence unequivocally identifies this as the first-line intervention. A 2025 study on the role of pH measurement in acute chemical injuries highlights that the initial clinical approach must focus on immediate and copious irrigation to normalize the tear film pH ^[1]. Furthermore, a comprehensive review on nanotechnology in treating these injuries reinforces that immediate and extensive irrigation serves as the foundational, time-sensitive emergency response upon which all subsequent therapies are built ^[2]. Delaying irrigation to perform other tasks, such as obtaining a history or administering medications, allows the chemical to continue its destructive penetration, worsening the injury from a potentially reversible insult to a permanently blinding one.

Analysis of Incorrect Options
- Option 1: Apply a sterile eye patch. Applying an eye patch before thorough irrigation is contraindicated. It traps the chemical agent against the cornea and conjunctiva, prolonging exposure and exacerbating the burn. The priority is to remove the causative agent, not to cover the eye. An eye patch may be considered much later in the treatment course for specific indications like recurrent corneal erosions, but never in the acute, pre-irrigation phase.
- Option 2: Administer prescribed topical anesthetic drops. While pain management is an important aspect of care, administering anesthetic drops is not the highest priority action. The primary goal is to stop the injury process by removing the chemical. Once continuous irrigation has been initiated, a topical anesthetic can be administered to facilitate patient comfort and cooperation, allowing for more effective irrigation, but it does not take precedence over starting the irrigation itself.
- Option 3: Obtain a detailed history and contact poison control. Obtaining a history, including the specific chemical agent, is a secondary step. The immediate action for any chemical ocular burn is the same regardless of the agent: copious irrigation. While knowing the chemical (e.g., alkali vs. acid) informs prognosis and specific late-stage management, and contacting poison control is valuable for systemic implications, these actions must not delay the initiation of irrigation. The mechanism of injury from an alkali burn, characterized by severe inflammation, oxidative stress, and rapid tissue destruction, underscores why physical removal of the agent through irrigation is the non-negotiable first step . The long-term complications of corneal neovascularization and fibrosis, which are the focus of novel therapies like nintedanib, are a consequence of the initial injury severity, which is directly modifiable by the speed of irrigation .