Which layer of the tear film is responsible for preventing evaporation of the aqueous layer?
Clre Ocular Anatomy
Question · Easy
What is the average horizontal diameter of the adult cornea?
Transition zone where the clear front of the eye meets the white outer coat.
Ocular anatomy
Guess the Term
Introduction & Exam Overview
0.1 About the CLRE Exam
Study guide
The Bowman's layer of the cornea is significant in contact lens wear because it:
Question · Medium
Read the clue and guess the term in 6 tries.
Game
What is the primary function of the conjunctival goblet cells?
Inner and outer corners where the upper and lower eyelids meet.
Giant papillary conjunctivitis (GPC) is most commonly associated with which type of contact lens wear?
A patient with keratoconus exhibits which characteristic corneal finding?
Small depression at the center of the macula where vision is sharpest.
0.2 How to Use This Study Guide
Which corneal layer is most responsible for maintaining corneal transparency through its regular arrangement of collagen fibrils?
Swap tiles to line up three of the same term.
Term Match
The endothelial pump mechanism is critical for contact lens wearers because it:
Question · Hard
Refractive disorder in which distant objects look blurry because light focuses in front of the retina.
Refractive errors
Corneal neovascularization in a contact lens wearer is most commonly caused by:
A patient presents with small white infiltrates at the corneal periphery, minimal pain, and no epithelial defect. The most likely diagnosis is:
___ lamp: instrument that sends a focused beam of light into the eye for magnified, three-dimensional viewing.
Clinical instrumentation
Ocular Anatomy: Adnexa
Tear Film: Layers, Glands & Break-Up Time
What does the 'K' reading in keratometry measure?
Clre Instrumentation
Flip two cards at a time to find matching terms.
Term Pairs
An average K reading of 44.00 D corresponds to approximately what corneal radius?
Noninvasive imaging technique that uses light to produce cross-sectional pictures of the cornea, anterior chamber, iris and angle.
When using a keratometer, mire images that are distorted or irregular suggest:
What is the primary advantage of corneal topography over standard keratometry?
Lens design used when cylinder power exceeds 1.0 diopter to correct both spherical and cylindrical error.
Prefitting evaluation
Conjunctiva, Lids, Lashes, Fornix & Canthi
The biomicroscope (slit lamp) is used in contact lens fitting primarily to:
Find five hidden terms in a grid of letters.
Term Search
Direct illumination with the biomicroscope involves:
Lens design with a firm gas-permeable center and a soft outer skirt.
Sodium fluorescein dye is used with RGP contact lenses to:
When evaluating tear break-up time (TBUT), a normal value is considered to be:
___ gas-permeable lens: firm lens that keeps its shape on the eye and is the type used for overnight orthokeratology.
Blink Rate, Lid Function & Contact Lens Wear Effects
An optical coherence tomographer (OCT) used in contact lens practice can measure:
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What does the Dk value of a contact lens material represent?
Clre Prefitting
Orientation of a toric lens's cylinder power, which must stay fixed on the eye so rotation does not blur vision.
Diagnostic fitting
Silicone hydrogel lens materials have largely replaced traditional hydrogel materials primarily because of:
A patient presents with a spectacle prescription of -3.00 -1.25 x 180. Which type of soft contact lens would BEST correct this patient's vision?
A minimal quantity of this is ground base-down into some soft lenses, using gravity to keep the lens rotation base down.
Ocular Anatomy: Anterior & Posterior Segment
Corneal Layers, Curvature, Topography & Metabolism
When converting a spectacle prescription to a contact lens prescription, vertex distance compensation is necessary when the prescription power exceeds:
A patient has K readings of 42.00 D @ 180 / 44.00 D @ 090. What type and amount of corneal astigmatism does this patient have?
Rinsing product used after cleaning and disinfection that some peroxide systems recommend before insertion.
Lens dispensing
Which of the following patients would be the BEST candidate for daily disposable contact lenses?
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