CPO FREE CPO Ocular Pharmacology and Medication Instillation Questions and Answers 2 — Questions and Answers
Question 1: A patient taking a systemic medication for a heart arrhythmia, amiodarone, presents with complaints of seeing colored halos around lights. Which ocular structure is most likely affected by deposits from this medication?
- Retina
- Optic Nerve
- Lens
- Cornea (Correct answer)
Correct answer: Cornea
Amiodarone is well-known to cause corneal verticillata, which are whorl-like deposits on the cornea. These deposits can lead to symptoms like seeing halos around lights. While amiodarone can also cause optic neuropathy, the symptom of halos is classically associated with the corneal changes.
Question 2: A 6-year-old child requires a cycloplegic refraction. The optometrist wants to use an agent with a strong effect but a shorter duration of action than atropine to minimize inconvenience for the child and parents. Which agent is the most appropriate choice?
- Tropicamide
- Phenylephrine
- Cyclopentolate (Correct answer)
- Homatropine
Correct answer: Cyclopentolate
Cyclopentolate is a potent cycloplegic agent commonly used for refractions in children. Its onset is rapid, and its duration of action (6-24 hours) is significantly shorter than atropine (7-12 days), making it a practical choice for routine clinical use. Tropicamide provides weaker cycloplegia, and phenylephrine is a mydriatic with no cycloplegic effect.
Question 3: A patient with severe glaucoma is prescribed a beta-blocker ophthalmic solution. To minimize the potential for systemic side effects like bradycardia, which instruction is most critical for the paraoptometric to provide?
- "Instill two drops to ensure an adequate dose reaches the eye."
- "Blink rapidly for 30 seconds after instilling the drop."
- "Apply gentle pressure to the corner of the eye near the nose for 30-60 seconds after instillation." (Correct answer)
- "Keep the eye drop bottle refrigerated to enhance its effect."
Correct answer: "Apply gentle pressure to the corner of the eye near the nose for 30-60 seconds after instillation."
Applying gentle pressure over the inner canthus performs punctal occlusion, which prevents the medication from entering the nasolacrimal duct and being absorbed systemically. This technique maximizes the drug's local effect on the eye while minimizing systemic absorption and potential side effects like slowed heart rate (bradycardia).
Question 4: A clinic uses multi-dose bottles of dilating drops for multiple patients. Which of the following actions represents a critical breach of aseptic technique that requires the bottle to be discarded or dedicated to a single patient?
- Forgetting to wash hands before instilling drops.
- The tip of the dropper bottle makes brief contact with the patient's lower eyelashes. (Correct answer)
- Placing the bottle cap on its side on a clean counter.
- Failing to check the medication's expiration date.
Correct answer: The tip of the dropper bottle makes brief contact with the patient's lower eyelashes.
Any contact between the tip of a multi-dose dropper bottle and a patient's eye, lids, or lashes contaminates the bottle. Once contaminated, the bottle must not be used on other patients to prevent cross-contamination and potential infection. It should either be discarded or used only for that specific patient.
Question 5: A patient with severe allergic conjunctivitis has not found relief with over-the-counter antihistamine drops. The ophthalmologist prescribes a short-term course of a topical corticosteroid. Which potential adverse effect is most important to monitor for with this class of medication?
- Corneal thinning
- Increased intraocular pressure (Correct answer)
- Pupil constriction
- Dry eye syndrome
Correct answer: Increased intraocular pressure
Topical corticosteroids are potent anti-inflammatory agents, but their use can lead to serious side effects. One of the most significant is an increase in intraocular pressure (IOP), which can lead to glaucoma if not monitored and managed. Long-term use also carries risks of cataract formation and increased susceptibility to infection.
Question 6: A patient is being educated on how to instill both an ophthalmic suspension and an ophthalmic ointment for a severe infection. What is the correct sequence and instruction for administration?
- Instill the ointment first, wait 5 minutes, then instill the suspension.
- Instill the suspension first, then immediately instill the ointment.
- Instill the suspension, wait at least 5 minutes, then instill the ointment. (Correct answer)
- The order does not matter as long as they are both administered.
Correct answer: Instill the suspension, wait at least 5 minutes, then instill the ointment.
When multiple types of eye medications are used, they should be administered in order of least to most viscous. A liquid suspension should be instilled first. One should then wait at least 5 minutes to allow the first medication to be absorbed before applying the more viscous ointment. Applying the ointment first would create a barrier, preventing the suspension from reaching the ocular surface effectively.
CPO FREE CPO Ocular Pharmacology and Medication Instillation Questions and Answers 2
A patient taking a systemic medication for a heart arrhythmia, amiodarone, presents with complaints of seeing colored halos around lights.
Which ocular structure is most likely affected by deposits from this medication?