Disorders of the Lens Practice Test

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• Phacodonesis describes tremor of which ocular structure?
• Name a modifiable risk factor for postoperative endophthalmitis.
• What are the 'sparkles' seen in hypermature cataracts?
• Where is posterior subcapsular cataract located within the lens?
• What is a “white cataract” and which layer does it involve predominantly?
• What are the two most important clinical questions for cataracts?
• What is the purpose of the posterior capsule in modern cataract surgery?
• Lensectomy is preferred over phacoemulsification in which scenarios?
• Which surgical procedure removes the lens entirely?
• Why is the lens considered metabolically active despite being avascular?
• What lens abnormality is characteristic of Weill-Marchesani syndrome?
• Which statement about the posterior capsule is true?
• What is a common complication of cataracts?
• Which LIU type is caused by capsule rupture leading to intraocular inflammation?
• How does pseudoexfoliation material appear on slit-lamp exam?
• Which is a common late postoperative complication that can limit visual improvement after successful cataract extraction?
• What dangerous event can occur if the pupil dilates in a subluxated lens?
• Which of the following is NOT a classic morphologic category of senile cataract?
• Why are diabetic cataracts less common in cats?
• Which laser is used to treat posterior capsular opacification?
• Which finding best explains why Morgagnian cataract may cause an illusion of vision improvement?
• Which IOL type is mounted to the iris via claw haptics and used when posterior capsule support is absent or inadequate?
• Name two major long-term risks after pediatric cataract surgery.
• Postoperative management after infant cataract removal often includes optical correction with what modality?
• Which statement best describes the key structural characteristics of the lens?
• Which part of the lens contains the oldest fibers?
• What is the primary mechanism of phacomorphic glaucoma?
• A congenital cataract may be unilateral or bilateral.
• Which preoperative measurements most commonly cause refractive surprises after IOL implantation?
• Which breed group is most predisposed to primary lens luxation?
• What age range is typical for primary lens luxation?
• Which statement correctly describes nuclear sclerosis?
• Scleral-fixated intraocular lens is indicated under which condition?
• In an older dog, nuclear sclerosis is best described as which of the following?
• What type of LIU is due to capsule rupture?
• Which category describes cataracts resulting from eye injuries?
• Hypermature cataract features commonly include which anterior lens capsule change?
• Lens displacement is categorized into which three groups?
• When is enucleation indicated in lens luxation?
• Name two retinal conditions that complicate cataract surgery planning.
• A 6-year-old diabetic dog presents with rapidly progressing lens opacity and new-onset uveitis; within weeks, glaucoma develops. What is the primary underlying mechanism leading to this complication?
• Which cataract stage is characterized by capsular wrinkling and protein aggregates?
• In infants with dense bilateral congenital cataracts, what is a possible subsequent surgical option after initial management?
• A dog with a history of chronic cataracts now has a wrinkled anterior lens capsule and visible refractile "+sparkles" within the lens, with a faint tapetal reflection still present. What is the correct classification of this cataract?
• Which category describes non-genetic causes of cataracts related to metabolism?
• What is the most common cause of primary lens luxation?
• Which syndrome is classically associated with anterior lenticonus?
• In lens-induced uveitis, which serious secondary complication can arise?
• Which clinical manifestation can Morgagnian cataracts create?
• A 10-year-old dog with blue-gray opacity in both lenses, normal menace, and normal pupillary responses; retroillumination shows no true opacity. What is the most likely diagnosis?
• The lens is avascular but metabolically active. Which statement best explains nutrient delivery?
• Regarding lens energy metabolism, which statement is correct?
• What is the slit-lamp hallmark of posterior subcapsular cataract?
• What is an iris-claw (Artisan) IOL and when might it be used?
• What structure suspends the lens in place?
• Posterior luxation is associated with which characteristic appearance?
• During cataract surgery, a posterior capsule rupture with vitreous loss is typically managed by what intraoperative action?
• Which intraoperative sign suggests significant zonular laxity?
• Incipient cataract involves what percentage of the lens volume?
• What is a key sign of anterior lens luxation?
• Which statement about Morgagnian cataract is true?
• Which feature is absent in mature cataracts?
• What does loss of PLR suggest in a cataract patient?
• What is nuclear sclerosis?
• Phacomorphic glaucoma is caused by what lens change?
• What is the success rate of cataract surgery in appropriate candidates?
• What does LOCS III stand for and what is its purpose?
• Which category would include dietary deficiencies leading to lens changes?
• What is phacoemulsification?
• Which statement best describes the combination of lens characteristics?
• Which intraoperative complication most increases the risk of vitreous loss during cataract surgery?
• The lens nucleus is primarily formed by fibers of what age?
• What is the main advantage of small-incision cataract surgery?
• What is the typical appearance of posterior lens luxation?
• Which type of luxation is less immediately dangerous?
• What is the posterior lens suture shape?
• Which imaging modality is best for evaluating the posterior segment when the view is blocked by a dense cataract?
• How is a posterior capsule rupture with vitreous loss typically managed intraoperatively?
• The tapetal reflection remains visible during which stage?
• Why is staging cataracts important?
• What is the primary function of the lens?
• What is the developmental relationship between lens epithelial cells and lens fibers?
• A dog presents with a dense white lens opacity with no tapetal reflection and absent menace response, but intact dazzle and PLR. How should this cataract be staged?
• Posterior capsular opacification is most directly due to which cellular event?
• Which practice most effectively reduces the risk of postoperative endophthalmitis?
• The tissue to which zonular fibers anchor is part of which structure?
• Which condition is described as tremor of the lens itself?
• What is the most effective treatment for restoring vision in cataracts?
• What is the purpose of a capsulorhexis?
• What type of LIU is due to protein leakage?
• What is iridodonesis?
• In Marfan syndrome, lens subluxation typically occurs in which direction?
• Define phacomorphic glaucoma.
• The outer region containing younger fibers is called what?
• Which feature is present in immature cataracts?
• The posterior suture shape is which?
• Which description correctly identifies a sulcus-supported IOL?
• What is the most common metabolic cause of cataracts in dogs?
• In uveitis, which intraocular pressure finding is typical?
• The posterior capsule acts as a barrier to the vitreous body, enabling which outcome?
• Why must latanoprost be dosed every 12 hours?
• Which option best describes amblyopia therapy after pediatric cataract management?
• What is the function of the zonules?
• Which cataract stage is described by the presence of refractile particles within the lens and a wrinkled anterior capsule?
• What is zonulopathy and which conditions predispose to it?
• Phacolytic glaucoma occurs due to leakage of lens proteins from a hypermature lens causing macrophage blockage of which structure?
• Scleral-fixated IOL is indicated in which scenario?
• Which statement about medical therapy for cataracts is accurate?
• What complication occurs if the lens becomes trapped in front of the pupil?
• Which diagnostic test best reveals the true severity of a cataract when direct viewing suggests only mild opacity?
• Amblyopia therapy after pediatric cataract surgery aims to do what?
• Which statement best distinguishes phacomorphic glaucoma from phacolytic glaucoma?
• Which process commonly causes posterior capsular opacification after cataract extraction?
• What portion of metabolism occurs aerobically in the lens?
• Which term describes complete displacement of the lens?
• What is a major vision-threatening risk of untreated pediatric cataract?
• Why is determining etiology important?
• What is a major complication following ICLE?
• A dog with lens subluxation is treated with latanoprost once daily. Two days later, the dog acutely develops severe pain and anterior lens luxation. What was the most likely cause of this progression?
• What percentage of lens energy metabolism is anaerobic?
• In Weill-Marchesani syndrome, the lens abnormality commonly leads to which refractive outcome?
• Which statement best describes the relationship between lens-induced uveitis and its secondary complications?
• What effect do cataracts have on vision?
• Which part of the lens contains the youngest fibers?
• The nutrient source for the lens comes from aqueous humor. Which feature facilitates this nutrient delivery?
• Which cataract type is defined by liquefaction of the cortex with sinking of the dense nucleus?
• What is the primary goal of medical therapy for cataracts?
• Why does pseudoexfoliation increase cataract surgery risk?
• What is phacodonesis?
• Where are lens epithelial cells located?
• What is lens luxation?
• Which statement about pseudoexfoliation syndrome is true?
• Which of the following are clinical signs of lens subluxation?
• An immature cataract is most accurately described as involving which volume of the lens?
• What is lens subluxation?
• Which condition is another potential complication of cataracts?
• What medication is used to manage lens subluxation?
• Which species has a lower incidence of diabetic cataracts due to reduced aldose reductase activity?
• The central region formed by older fibers is called what?
• What is a primary goal in emergency management of lens luxation to prevent vision loss?
• Where do new lens fibers form?
• Intraoperative risk with pseudoexfoliation during cataract surgery includes:
• Which enzyme is involved in the sorbitol pathway that contributes to diabetic cataracts?
• A Jack Russell Terrier presents with acute painful vision loss. Examination reveals a clear circular structure in the anterior chamber and markedly increased IOP. What is the most likely diagnosis?
• In homocystinuria, the lens edge typically displaces in which direction?
• What is the difference between 'in-the-bag' and 'sulcus-supported' IOL implantation?
• The anterior suture shape in most domestic species is which?
• How does nuclear sclerosis appear on exam?
• What is couching in lens luxation management?
• What is the anterior lens suture shape in most domestic species?
• What is the main advantage of small-incision cataract surgery in modern lens management?
• What are the two main cell populations in the lens?
• What process increases lens volume over time?
• What is a cataract?
• Which sign is typically preserved in cataract patients despite lens opacities?
• What is the mechanism of latanoprost in lens instability?
• The definitive intervention for restoring vision in cataract-affected eyes is which?
• What is the clinical hallmark of a congenital cataract?
• Iridodonesis is best described as?
• Does nuclear sclerosis impair vision clinically?
• Latanoprost's effect on the pupil in lens instability is to cause which change?
• Which finding is NOT typically associated with lens subluxation?
• How can glare testing and contrast sensitivity testing help in lens disorders?
• What term describes manual repositioning of the lens posteriorly?
• What is the recommended approach for a small subluxated lens with adequate zonular support during cataract surgery?
• Which statement about pseudoexfoliation syndrome is true?
• How is a mature cataract defined?
• Why is anterior lens luxation considered an emergency?
• Which reflexes should remain intact despite cataracts?
• Which cataract type is most strongly associated with long-term corticosteroid use?
• Which is a common late postoperative complication after cataract extraction that can limit visual improvement?
• What is the preferred initial management for a dense congenital cataract with amblyopia risk?
• Which statement correctly differentiates lens subluxation from lens luxation?
• What is the clinical feature of anterior lenticonus in Alport syndrome?
• Presbyopia is primarily due to what mechanism?
• When is a staged approach used in pediatric cataract management?
• During cataract surgery, which device is implanted to restore vision?
• What is the mechanism of diabetic cataract formation?
• Which statement best defines aphakia?
• What anatomical structure suspends the crystalline lens from the ciliary body?
• What is the function of lens epithelial cells?
• Which systemic conditions are classically associated with ectopia lentis?
• What happens to the lens with aging?
• A dog presents with lens opacity that appears mild on direct illumination but completely blocks tapetal reflection on retroillumination. The owner reports blindness. What is the most accurate interpretation?
• In lens-induced uveitis, which serious secondary complication can arise?
• What is the recommended approach to managing dense bilateral congenital cataracts in infancy?
• Anterior lens luxation is a risk for which glaucoma type if the lens blocks the pupil?
• Do medical treatments reverse cataracts?
• Which imaging modality is commonly used to evaluate the macula and optic nerve when planning cataract surgery?
• Which LIU type results from leakage of lens proteins through the capsule?
• What is an aphakic crescent?
• What is lens-induced uveitis (LIU)?
• What are the key features of hypermature cataracts?
• What causes the wrinkled appearance of hypermature cataracts?
• Which category would include lens changes due to exposure to certain chemicals?
• Which inflammatory lens condition can lead to secondary glaucoma through lens-induced uveitis?
• Which sign on retinoscopy is associated with anterior lenticonus?
• An immature cataract involves what percentage of lens volume?
• Phacodonesis is best described as which of the following?
• For a dense congenital cataract with amblyopia risk, the recommended initial management is:
• As cataracts progress, what happens to the menace response?
• Which statement correctly lists the classic morphologic categories of senile cataract?
• Zonules attach to which structure?
• How can nuclear sclerosis be distinguished from cataract?
• What are the major categories of cataract causes?
• Differentiate anterior lenticonus from posterior lenticonus.
• Which systemic disease is commonly associated with early-onset cataracts?
• Which clinical sign suggests lens-induced uveitis?
• Which fluid provides nutrition to the lens?