Podcast
Questions and Answers
Who was the first to demonstrate that changes in the crystalline lens were responsible for the changes in focus?
Who was the first to demonstrate that changes in the crystalline lens were responsible for the changes in focus?
- Bowman & Burke
- Ariette Acevedo, O.D.
- Thomas Young (correct)
- Finchman
Which type of fibers in the ciliary muscle originate in the scleral spur and insert into the equatorial portion of the suprachoroid?
Which type of fibers in the ciliary muscle originate in the scleral spur and insert into the equatorial portion of the suprachoroid?
- Radial fibers
- Circular fibers
- Longitudinal (meridional) fibers (correct)
- Longitudinal (meridional) and Radial fibers
Who described the ciliary muscle as occupying most of the ciliary body and having the shape of a 'prismatic ring' tha consists in 3 fibers(longitudinal, radial,circular)?
Who described the ciliary muscle as occupying most of the ciliary body and having the shape of a 'prismatic ring' tha consists in 3 fibers(longitudinal, radial,circular)?
- Ariette Acevedo, O.D.
- Thomas Young
- Bowman & Burke
- Finchman (correct)
What did Bowman & Burke discover in 1847 that is responsible for the lens power changes during accommodation?
What did Bowman & Burke discover in 1847 that is responsible for the lens power changes during accommodation?
What is the main function of the ciliary muscle during accommodation?
What is the main function of the ciliary muscle during accommodation?
What is the shape of the ciliary muscle as described by Finchman in 1937?
What is the shape of the ciliary muscle as described by Finchman in 1937?
What are the three types of fibers that make up the ciliary muscle?
What are the three types of fibers that make up the ciliary muscle?
Who identified the ciliary muscle as responsible for the lens power changes during accommodation?
Who identified the ciliary muscle as responsible for the lens power changes during accommodation?
When there is a change in dioptric power of the crystalline lens to have and maintain an in-focus retinal image of an object in the fovea, what process is occurring?
When there is a change in dioptric power of the crystalline lens to have and maintain an in-focus retinal image of an object in the fovea, what process is occurring?
What is responsible for moving the eyes from the anatomical position of rest to a more convergent position?
What is responsible for moving the eyes from the anatomical position of rest to a more convergent position?
Which type of prism produces convergence?
Which type of prism produces convergence?
What is used to calculate the amplitude of convergence?
What is used to calculate the amplitude of convergence?
What is measured binocularly to determine the ability to converge while maintaining fusion?
What is measured binocularly to determine the ability to converge while maintaining fusion?
What should be done if a patient does not report blur but experiences double vision during NPC testing?
What should be done if a patient does not report blur but experiences double vision during NPC testing?
What does the NPC test record the distance at which the patient reports?
What does the NPC test record the distance at which the patient reports?
What are common errors in NPC testing?
What are common errors in NPC testing?
What is the most common NPC error?
What is the most common NPC error?
What does Base In (BI) prism produce?
What does Base In (BI) prism produce?
What is responsible for the ability to converge while maintaining fusion?
What is responsible for the ability to converge while maintaining fusion?
Which structure consists of three bundles: anterior, equatorial, and posterior?
Which structure consists of three bundles: anterior, equatorial, and posterior?
What is part of the ciliary muscle structure?
What is part of the ciliary muscle structure?
What creates the vitreous base?
What creates the vitreous base?
What are the changes during accommodation?
What are the changes during accommodation?
What allows the anterior lens surface to become highly curved during accommodation?
What allows the anterior lens surface to become highly curved during accommodation?
What is the amplitude of accommodation based on?
What is the amplitude of accommodation based on?
What is used to evaluate the amplitude of accommodation?
What is used to evaluate the amplitude of accommodation?
What is convergence mediated by?
What is convergence mediated by?
What effect do minus lenses have on convergence and accommodation?
What effect do minus lenses have on convergence and accommodation?
What happens to the age-related expected amplitude of accommodation?
What happens to the age-related expected amplitude of accommodation?
What effect do plus lenses have on convergence and accomodation
What effect do plus lenses have on convergence and accomodation
Study Notes
Ciliary Muscle and Zonular Fibers
- Ciliary muscle has radial and zonular fibers, with the zonular fibers consisting of three bundles: anterior, equatorial, and posterior.
- Schlemm’s canal and TM scleral spur are part of the ciliary muscle structure.
- The ciliary body has fibers forming a dense meshwork and extending into the vitreous, creating the vitreous base.
- Changes during accommodation include pupil constriction, lens movement, and choroid displacement.
- The lens capsule's thickness varies, allowing the anterior lens surface to become highly curved during accommodation.
- Accommodation range and amplitude are based on the far and near points of accommodation.
- The amplitude of accommodation is the difference between the dioptric values of the near and far points of accommodation.
- Near point of accommodation (NPA) is used to evaluate the amplitude of accommodation, and the procedure is performed monocularly.
- Convergence is the movement of the eyes turning inward, mediated by the MR muscle and Oculomotor Nerve.
- Minus lenses cause more convergence and require more accommodation, while plus lenses cause more divergence and require less accommodation.
- The age-related expected amplitude of accommodation decreases with age, as per Donder’s table for age.
- Hofstetter’s formula provides the expected amplitude of accommodation based on age.
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Description
Test your knowledge of the ciliary muscle and zonular fibers with this quiz. Explore topics such as accommodation, changes during lens movement, and age-related changes in the amplitude of accommodation. Delve into the structure and function of the ciliary muscle and its role in vision.
