COA Ophthalmic Instruments and Procedures 2 — Questions and Answers
Question 1: What is the primary function of the Goldmann applanation tonometer?
- Measure corneal curvature
- Measure crystalline lens thickness
- Measure intraocular pressure (Correct answer)
- Evaluate the optic nerve
Correct answer: Measure intraocular pressure
The Goldmann applanation tonometer is considered the gold standard for measuring intraocular pressure.
Question 2: Which instrument is used to measure corneal thickness (pachymetry)?
- Keratometer
- Pachymeter (Correct answer)
- Perimeter
- Autorefractor
Correct answer: Pachymeter
A pachymeter measures corneal thickness, which affects IOP accuracy and refractive surgery candidacy.
Question 3: The Humphrey Visual Field Analyzer performs which type of perimetry?
- Kinetic perimetry only
- Goldmann bowl perimetry
- Static automated perimetry (Correct answer)
- Amsler grid testing
Correct answer: Static automated perimetry
The Humphrey Field Analyzer uses static automated perimetry, presenting stationary stimuli at varying intensities.
Question 4: What is the function of a pupillometer in ophthalmic practice?
- Measure intraocular pressure
- Measure the interpupillary distance (Correct answer)
- Test color vision
- Examine the optic disc
Correct answer: Measure the interpupillary distance
A pupillometer measures the pupillary distance (PD) to ensure optical centers of lenses align with visual axes.
Question 5: Specular microscopy is used to evaluate which ocular structure?
- Retinal nerve fiber layer
- Corneal endothelium (Correct answer)
- Crystalline lens density
- Trabecular meshwork
Correct answer: Corneal endothelium
Specular microscopy images corneal endothelial cells to assess their density, size, and morphology.
Question 6: OCT (Optical Coherence Tomography) in glaucoma management primarily measures:
- Intraocular pressure fluctuation
- Visual acuity threshold
- Retinal nerve fiber layer thickness (Correct answer)
- Anterior chamber angle
Correct answer: Retinal nerve fiber layer thickness
OCT measures retinal nerve fiber layer thickness, enabling detection and monitoring of glaucomatous structural damage.
COA Ophthalmic Instruments and Procedures 2
What is the primary function of the Goldmann applanation tonometer?