Radius of curvature - Study guides, Class notes & Summaries

NCLE basic Exam Questions and answers, 100% Accurate/ What is the Secondary/intermediate curve? - -The curve on the posterior side of the contact lense between the base curve and peripheral curve. Usually 0.7mm to 1.6mm flatter than the base curve radius. The width is affected by the OZ diameter and peripheral width. What is the peripheral curve? - -The outermost curve on the posterior side of the contact lens. It clears the flatter periphery and prevents lens impingement in the limbal...

NCLE Advanced Certification Exam LATEST 2024 ACTUAL EXAM CONTAINS QUESTIONS AND CORRECT DETAILED ANSWERS WITH RATIONALES VERIFIED ANSWERS ALREADY GRADED A+ The answer is D. The posterior optical zone will directly affect the lens to cornea relationship of a rigid gas permeable lens. If the posterior optical zone is steepened, it will increase the sagittal depth. If it is flattened, it will decrease the sagittal depth. Changing the power, which is accomplished by changing the anterio...

How does refractive power of a lens change if its radius of curvature decreases? - Answer-The power increases How does refractive power of a lens change if its radius of curvature increases? - Answer-The power decreases What is radius of curvature in case of a lens? - Answer-Flattener lens= larger radius of curvature. More rounded lens=lesser radius of curvature. How does refractive power of a lens change if its index of refraction increases? - Answer-Refractive power will increase Calc...

NCLE basic Exam Kit Questions with correct Answers 2023 What is the Secondary/intermediate curve? - ️️ The curve on the posterior side of the contact lense between the base curve and peripheral curve. Usually 0.7mm to 1.6mm flatter than the base curve radius. The width is affected by the OZ diameter and peripheral width. What is the peripheral curve? - ️️ The outermost curve on the posterior side of the contact lens. It clears the flatter periphery and prevents lens impingement in ...

1. The sagittal depth of a rigid gas permeable contact lens can be altered without changing the diameter by: A. Changing the power B. Changing the edge design C. Changing the radius of curvature of the anterior optical zone D. Changing the radius of curvature of the posterior optical zone -Answer The answer is D. The posterior optical zone will directly affect the lens to cornea relationship of a rigid gas permeable lens. If the posterior optical zone is steepened, it will increase the sa...

NCLE Study Questions with Correct Answers annular bifocal contact - Answer-A lens with distance portion ground into the center of the lens and the near portion ground into the periphery aphakic lenses - Answer-lenses designed for post-cataract fitting apical zone of cornea - Answer-the central portion of the cornea with a constant radius of curvature. Also called the corneal cap. artificial tears - Answer-medications, many of them over the counter, to treat dry eyes aspheric lens ...

COA Study Guide Questions and Answers 100% Verified BIOMETRY (3%) Axial length is provided by which measurement? A) Precorneal tear film to the posterior vitreous face B) Anterior corneal surface to the macula C) Anterior corneal surface to the optic disc D) Anterior pole to the posterior pole C) Anterior corneal surface to the optic disc BIOMETRY (3%) How are ultrasound biometric measurements obtained? A) The anterior lens spike should be lower than the posterior lens spike. ...

"K" is the ____ of the two meridians - flatter 4 refractive mediums - -Cornea -Aqueous -Crystalline Lens -Vitreous A ____ fitting lens is fitted flatter than K and will touch at the corneal apex with excessive movement over the cornea. It is not uncommon for this lens to fall off the eye or become easily decentered. Such a lens may cause abrasions at the corneal apex and may also cause corneal edema. - loose A lens with a steep CPC that vaults the corneal apex and touches the cornea at...

Certified Ophthalmic Assistant Exam with 100%Correct Answers 2024. How are systemic medications administered? - Answer Orally, injection (subcutaneously or intramuscularly) or intravenously How should drops be properly instilled into a patient's eye? - Answer Into the lower cul de sac (lower fornix) What does the term idiosyncrasy refer to with ophthalmic drugs? - Answer A bizarre, peculiar reaction to a drug that is not commonly seen, such as tremors, excitability or even collapse What...

base curve - Answer refers to the radius of curvature of the central posterior surface of the lens. It may be expressed in diopters of surface power (D) or in millimeters (mm) of radius or curvature. optical zone - Answer the chord diameter over which the base curve extends on the posterior surface of the contact lens, described in millimeters secondary or intermediate curves - Answer lies between the base curve and the peripheral curve on the posterior lens surface, usually 0.70m...