Elsevier eBooks+ Activation
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Questions and Answers

What is the purpose of scratching the box below in the instructions?

  • To find the contact information for technical support
  • To reveal the access code for eBook activation (correct)
  • To access the terms of the limited license agreement
  • To access the eBook directly without registration

    • What is the consequence of transferring the eBook access to another party?

  • The access code becomes invalid
  • The new party gains permanent access
  • The original owner's access is revoked
  • It violates the terms of the limited license agreement (correct)

    • Who is NOT listed as an editor or associate editor of STEINERT’S Cataract Surgery?

  • Mitchell P. (correct)
  • Nicole R. Fram, MD
  • David F. Chang, MD
  • Thomas Kohnen, MD, PhD, FEBO

    • What is the first step to activate the eBook version of STEINERT’S Cataract Surgery?

    <p>Visit <a href="http://ebooks.health.elsevier.com/">http://ebooks.health.elsevier.com/</a></p> Signup and view all the answers

    Where can you find the PIN required for eBook activation?

    <p>Inside cover of the book</p> Signup and view all the answers

    Who is the Vice Chair of Clinical Ophthalmology at the Gavin Herbert Eye Institute?

    <p>Weikert, MD</p> Signup and view all the answers

    Where is the Cullen Eye Institute located?

    <p>Houston, Texas</p> Signup and view all the answers

    Which edition of Steinert’s Cataract Surgery is the latest?

    <p>Fourth Edition</p> Signup and view all the answers

    How many previous editions of the book were copyrighted before 2023?

    <p>3</p> Signup and view all the answers

    Where was the book 'Steinert’s Cataract Surgery' printed?

    <p>India</p> Signup and view all the answers

    Who is the Content Strategist for the publication?

    <p>Kayla Wolfe</p> Signup and view all the answers

    What is the ISBN of 'Steinert’s Cataract Surgery, Fourth Edition'?

    <p>978-0-323-56811-1</p> Signup and view all the answers

    According to the copyright notice, what must practitioners and researchers rely on?

    <p>Their own experience and knowledge</p> Signup and view all the answers

    What is the initial action that induces the surface ectoderm to thicken and differentiate into a lens precursor?

    <p>Formation of optic vesicles</p> Signup and view all the answers

    At what stage does the lens vesicle break off the stalk, connecting it to the surface ectoderm?

    <p>At week 4 of gestation</p> Signup and view all the answers

    What does the outer basement membrane of the lens vesicle hypertrophies to become?

    <p>The elastic lens capsule</p> Signup and view all the answers

    What do the posterior cells of the lens vesicle rapidly elongate to form by the end of week 4 of gestation?

    <p>The primary lens fibers</p> Signup and view all the answers

    What happens as the lens pit continues to invaginate?

    <p>The surface ectoderm thickens</p> Signup and view all the answers

    What are the optic vesicles?

    <p>Outpouchings of the diencephalon</p> Signup and view all the answers

    What is the shape of the adult lens?

    <p>Biconvex</p> Signup and view all the answers

    During what stage of gestation do the lens fibers form the fetal nucleus?

    <p>Week 6 to 7</p> Signup and view all the answers

    What is the role of the retina in lens embryogenesis?

    <p>Providing inductive signals to regulate growth and the A-P axis of the lens</p> Signup and view all the answers

    What structures form Y-shaped sutures unique to the fetal growth stage at around week 8?

    <p>Secondary lens fibers</p> Signup and view all the answers

    To what structure does the hyaloid artery supply nutrients during fetal development?

    <p>Tunica vasculosa lentis</p> Signup and view all the answers

    What causes the lens to become more spherical during accommodation?

    <p>Contraction of zonular fibers</p> Signup and view all the answers

    What is the nutritive structure supplied by the hyaloid artery during fetal development?

    <p>Tunica vasculosa lentis</p> Signup and view all the answers

    At what age does the lens change shape from a slightly rounded ovoid to a more flattened ovoid?

    <p>Advanced age</p> Signup and view all the answers

    What is the approximate diameter of the adult lens?

    <p>4 to 5mm</p> Signup and view all the answers

    Study Notes

    eBook Access and Information

    • Transferring eBook access to another party is not allowed, and it will result in termination of access to the eBook.
    • The first step to activate the eBook version of STEINERT’S Cataract Surgery is to scratch the box below to reveal the PIN.
    • The PIN required for eBook activation can be found in the box.

    Editors and Institutions

    • Dr.Namrata Sharma is not listed as an editor or associate editor of STEINERT’S Cataract Surgery.
    • Dr.Roger F. Steinert is the Vice Chair of Clinical Ophthalmology at the Gavin Herbert Eye Institute.
    • The Cullen Eye Institute is located at Baylor College of Medicine.

    Book Information

    • The latest edition of Steinert’s Cataract Surgery is the Fourth Edition.
    • There were three previous editions of the book copyrighted before 2023.
    • The book 'Steinert’s Cataract Surgery' was printed in the United States.
    • The Content Strategist for the publication is Michael W. Korn.
    • The ISBN of 'Steinert’s Cataract Surgery, Fourth Edition' is 978-1-975-144-54-9.

    Lens Embryogenesis

    • Practitioners and researchers must rely on their own professional judgment and clinical experience when using the information provided in the book.
    • The initial action that induces the surface ectoderm to thicken and differentiate into a lens precursor is the interaction with the optic vesicle.
    • At the 3-week stage, the lens vesicle breaks off the stalk, connecting it to the surface ectoderm.
    • The outer basement membrane of the lens vesicle hypertrophies to become the lens capsule.
    • By the end of week 4 of gestation, the posterior cells of the lens vesicle rapidly elongate to form primary lens fibers.
    • As the lens pit continues to invaginate, it forms a lens vesicle.
    • The optic vesicles are the structures that induce the surface ectoderm to form a lens precursor.
    • The shape of the adult lens is biconvex.
    • During the 4-8 week stage of gestation, the lens fibers form the fetal nucleus.
    • The role of the retina in lens embryogenesis is to induce the formation of the lens precursor.
    • The structures that form Y-shaped sutures unique to the fetal growth stage at around week 8 are the lens fibers.
    • The hyaloid artery supplies nutrients to the lens during fetal development.
    • During accommodation, the lens becomes more spherical due to the contraction of the ciliary muscles.
    • The nutritive structure supplied by the hyaloid artery during fetal development is the lens.
    • At around age 20-30, the lens changes shape from a slightly rounded ovoid to a more flattened ovoid.
    • The approximate diameter of the adult lens is 9-10 mm.

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    Learn how to activate the eBook version of your Elsevier title at no additional charge. Follow the simple steps to unlock access to your eBook and customize your reading experience.

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