Free CPO Ocular Pharmacology and Medication Instillation Questions and Answers 1 — Questions and Answers
Question 1: Which type of ophthalmic medication is used to dilate the pupil?
- Miotics
- Mydriatics (Correct answer)
- Anesthetics
- Antibiotics
Correct answer: Mydriatics
Mydriatics are a class of drugs that cause the pupil to dilate (mydriasis). They are commonly used for fundus examinations to get a better view of the retina. Miotics, in contrast, constrict the pupil.
Question 2: When instilling eye drops, where should the drop be placed to minimize systemic absorption and maximize ocular contact?
- Directly onto the center of the cornea
- In the upper fornix
- In the lower cul-de-sac (Correct answer)
- On the caruncle (inner corner)
Correct answer: In the lower cul-de-sac
Instilling the drop into the lower cul-de-sac (the pocket formed by gently pulling down the lower eyelid) allows the medication to pool and be absorbed by the eye's surface tissues. Placing it directly on the sensitive cornea can cause excessive blinking and tearing, leading to loss of the drop.
Question 3: In addition to dilating the pupil, what is the primary function of a cycloplegic agent like cyclopentolate?
- To constrict blood vessels
- To numb the cornea
- To temporarily paralyze the ciliary muscle (Correct answer)
- To treat bacterial infections
Correct answer: To temporarily paralyze the ciliary muscle
Cycloplegic agents paralyze the ciliary muscle, which controls accommodation (the eye's ability to focus). This is crucial for obtaining an accurate refractive measurement (refraction), especially in children and young adults.
Question 4: An ophthalmic medication bottle with a red cap typically indicates which class of drug?
- Miotics (Green Cap)
- Steroids (Pink Cap)
- Mydriatics and Cycloplegics (Correct answer)
- Beta-blockers (Yellow or Blue Cap)
Correct answer: Mydriatics and Cycloplegics
The pharmaceutical industry uses a standardized color-coding system for ophthalmic medication caps to prevent errors. Red caps signify mydriatics and cycloplegics, which can be dangerous if used incorrectly, such as in a patient with a narrow anterior chamber angle.
Question 5: What is the primary purpose of applying punctal occlusion after instilling eye drops?
- To increase the blink rate
- To prevent the drop from evaporating
- To reduce systemic absorption of the medication (Correct answer)
- To clean the eyelid margin
Correct answer: To reduce systemic absorption of the medication
Punctal occlusion involves gently pressing on the inner corner of the eye to block the tear ducts (puncta). This keeps the medication in contact with the eye longer and prevents it from draining into the nasal cavity and being absorbed into the bloodstream, which reduces potential systemic side effects.
Question 6: Which of the following is a common topical anesthetic used in ophthalmology for procedures like tonometry?
- Timolol
- Pilocarpine
- Proparacaine (Correct answer)
- Prednisolone
Correct answer: Proparacaine
Proparacaine is a widely used topical anesthetic that quickly numbs the surface of the eye. This allows for painless procedures such as intraocular pressure measurement (tonometry) or foreign body removal. Timolol is a beta-blocker, pilocarpine is a miotic, and prednisolone is a steroid.
Free CPO Ocular Pharmacology and Medication Instillation Questions and Answers 1
Which type of ophthalmic medication is used to dilate the pupil?