Mixed Deck — All ABO Topics Flashcards

What does the term 'emmetropia' describe?

Answer: An eye with no refractive error

Emmetropia describes the ideal refractive state where parallel light rays focus precisely on the retina without any corrective lens.

How should ABO professionals approach client or stakeholder communication?

Answer: Use clear, professional language appropriate to the audience, confirm understanding, and document key communications

Effective communication tailored to the audience's knowledge level is essential for building trust, ensuring understanding, and achieving professional objectives.

What is the impact of regulatory changes on ABO professionals?

Answer: Regulatory changes require updating practices, procedures, and documentation to maintain compliance

Professionals must monitor and adapt to regulatory changes that affect their practice, ensuring continued compliance and effective service delivery.

When a patient complains of 'jack-in-the-box' phenomenon with new bifocals, the most likely cause is:

Answer: Segment set too high

The 'jack-in-the-box' effect occurs when the bifocal segment is fitted too high, causing objects to pop in and out of view abruptly at the segment line.

How do ABO professionals contribute to organizational success?

Answer: By applying specialized knowledge to solve problems, reduce risks, improve processes, and drive strategic outcomes

Certified professionals bring specialized expertise that directly contributes to organizational goals through problem-solving, risk reduction, process improvement, and strategic decision support.

How does continuing education benefit ABO professionals?

Answer: It ensures practitioners stay current with evolving standards, technologies, and best practices

Professional fields evolve constantly — continuing education ensures practitioners maintain competence and stay current with industry developments.

A patient with a +3.00 D prescription is fitted with a frame where the pupillary distance requires 4mm of nasal decentration per eye. What horizontal prism effect results?

Answer: 1.2 prism diopters BI per eye

Using Prentice's Rule: P = D × d = 3.00 × 0.4 cm = 1.2 prism diopters; nasal decentration with a plus lens creates base-in prism.

A high-minus lens will have the thinnest point at the:

Answer: Edge of the lens

Minus lenses are thicker at the center and thinner at the edges, so the edge is the thinnest point.

A patient with rheumatoid arthritis presents with a painless, white, avascular area of thinning at the limbus. What is the most likely diagnosis?

Answer: Peripheral ulcerative keratitis

Peripheral ulcerative keratitis (PUK) is a limbal thinning condition associated with systemic autoimmune diseases like rheumatoid arthritis.

How should ABO professionals handle conflicts of interest?

Answer: Disclose potential conflicts, recuse when appropriate, and always prioritize the client's best interests

Conflicts of interest must be identified, disclosed, and managed transparently to maintain professional integrity and client trust.

A 45-year-old presents with a sudden, painful red eye, corneal edema, mid-dilated non-reactive pupil, and IOP of 58 mmHg. What is the most likely diagnosis?

Answer: Acute angle-closure glaucoma

Acute angle-closure glaucoma presents with a painful red eye, corneal edema, mid-dilated pupil, and markedly elevated IOP.

Stand magnifiers are optically designed so that the image they produce is located at which focal distance?

Answer: At infinity, requiring no additional accommodation or add

A stand magnifier places the object at its focal point, producing a virtual image at optical infinity that requires no accommodation (or only the patient's habitual near add) to view.

A positive result on the Randot Stereotest indicates:

Answer: Bifoveal fixation and intact binocular vision

Passing the Randot Stereotest demonstrates bifoveal fixation and functional binocular vision with intact stereopsis.

Which base curve selection guideline applies when fitting rigid gas-permeable (RGP) contact lenses?

Answer: Align the lens base curve with the flattest K

The standard RGP fitting philosophy is to align the lens base curve with the flattest keratometry reading to achieve an 'on K' or alignment fit.

What is the standard pupillary distance measurement method used when fitting progressive addition lenses?

Answer: Monocular PD measured from each pupil to the bridge

For PALs, monocular PD is the preferred method, measuring from the center of each pupil to the bridge of the nose independently.

Which portion of the aqueous humor drainage system is located in the angle of the anterior chamber?

Answer: Trabecular meshwork

The trabecular meshwork lines the angle of the anterior chamber and is the primary site of aqueous humor outflow resistance.

Which condition is characterized by fine, diffuse corneal punctate staining in a patient wearing silicone hydrogel lenses with a preserved multipurpose solution?

Answer: Solution-induced corneal staining (SICS)

Solution-induced corneal staining (SICS) results from an incompatibility reaction between certain preservatives (especially PHMB or Alexidine) and silicone hydrogel lens materials.

What measurement determines the vertical position of a progressive lens on the patient's face?

Answer: Fitting height

The fitting height measures from the bottom of the lens to the center of the pupil, crucial for proper placement of the progressive corridor.

What is the primary measurement needed before fitting rigid gas permeable (RGP) contact lenses?

Answer: Corneal curvature (keratometry readings)

Keratometry readings provide the corneal curvature measurements essential for selecting the initial base curve of an RGP lens.

The primary purpose of a suppression scotoma in a patient with constant strabismus is to:

Answer: Eliminate diplopia by inhibiting the image from the deviating eye's fovea

Cortical suppression of the fovea of the deviating eye is an adaptive response to prevent diplopia (and visual confusion) caused by the misaligned eye.