Anatomy of the Eye Quiz

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Questions and Answers

Which bone is NOT part of the bony orbit?

  • Maxilla
  • Zygomatic
  • Mandible (correct)
  • Frontal

What role do the lacrimal glands play in eye health?

  • Regulate the intraocular pressure
  • Produce tears to maintain corneal moisture (correct)
  • Facilitate the movement of ocular muscles
  • Protect the eye from infections

Which of the following structures is part of the conjunctiva?

  • Palpebral portion (correct)
  • Retina
  • Eyelid
  • Lacrimal sac

How do the extraocular muscles generate eye movement?

<p>By alternating contractions of antagonist muscles (B)</p> Signup and view all the answers

Where is the aqueous humor located in the eye?

<p>In front of the lens (C)</p> Signup and view all the answers

What component contributes to the cushioning of the eyeball in the orbital cavity?

<p>Orbital fat (B)</p> Signup and view all the answers

Which of the following is an accurate description of the vitreous humor?

<p>It provides structural support to the retina. (D)</p> Signup and view all the answers

What is one procedural consideration for ophthalmology surgery?

<p>Ensuring proper eye medication instillation (B)</p> Signup and view all the answers

Which structure of the eye is considered the most important in the refractive apparatus?

<p>Cornea (D)</p> Signup and view all the answers

What type of positioning is commonly recommended for patients undergoing ophthalmic surgeries?

<p>Supine position (D)</p> Signup and view all the answers

What is the purpose of dilating drops used in ophthalmic surgeries?

<p>To dilate pupils for intraocular surgery (D)</p> Signup and view all the answers

During which phase is constant description and reinforcement particularly important for ophthalmic patients?

<p>Pre-operative and pre-induction (D)</p> Signup and view all the answers

Which of the following instruments is NOT typically used in ophthalmic surgeries?

<p>Suture scissors (A)</p> Signup and view all the answers

What is the sequence of counts for ophthalmic surgeries?

<p>Initial Count → Closing Count → Final Count (D)</p> Signup and view all the answers

Which one of the following statements about the perioperative nurse's role is correct?

<p>They must ensure the safety strap is applied before the procedure. (B)</p> Signup and view all the answers

What is a common characteristic of patients who undergo ophthalmology procedures?

<p>They range from premature infants to elderly patients. (D)</p> Signup and view all the answers

Which of these instruments is specifically designed for intraocular surgery?

<p>Vannas lens scissors (A)</p> Signup and view all the answers

What is the primary reason for securing a patient's return electrode pad during surgery?

<p>To ensure accurate monitoring and prevent burns. (B)</p> Signup and view all the answers

What is a potential consequence of experiencing an increase in floaters?

<p>Possible retinal detachment (B)</p> Signup and view all the answers

Which treatment is typically employed to address neovascularization in diabetic retinopathy?

<p>Electrocoagulation (A)</p> Signup and view all the answers

What surgical procedure involves the use of a cryoprobe?

<p>Intra Capsular Cataract Extraction (ICCE) (C)</p> Signup and view all the answers

How does scleral buckling aid in the treatment of retinal detachment?

<p>By compressing the choroid to push the retina back (B)</p> Signup and view all the answers

What is the primary purpose of vitrectomy surgery?

<p>To remove opaque vitreous gel and allow treatment of underlying conditions (A)</p> Signup and view all the answers

What is the primary purpose of a cryotherapy machine in ophthalmic procedures?

<p>To induce an inflammatory response for sealing retinal breaks. (A)</p> Signup and view all the answers

In the context of strabismus surgery, what does the term 'recession' refer to?

<p>Weakening the muscle by reattaching it at a further back point. (B)</p> Signup and view all the answers

What condition does hypertropia specifically describe?

<p>One eye positioned higher than the other. (B)</p> Signup and view all the answers

What is the primary indication for an enucleation procedure?

<p>For a blind, painful eye or intraocular tumors. (D)</p> Signup and view all the answers

What type of surgery involves the removal of a chalazion?

<p>Eyelid surgery to alleviate meibomian gland obstruction. (B)</p> Signup and view all the answers

What does extropian repair address?

<p>The sagging and eversion of the lower eyelid. (B)</p> Signup and view all the answers

Which of the following procedures involves the excision of conjunctival tissue?

<p>Pterygium excision to eliminate corneal encroachment. (D)</p> Signup and view all the answers

What is the role of the operating microscope in ophthalmic surgeries?

<p>To enhance magnification and illumination during procedures. (D)</p> Signup and view all the answers

Which type of misalignment is indicated by esotropia?

<p>Inward turning of one or both eyes. (A)</p> Signup and view all the answers

What is the purpose of suturing a round implant in an enucleation procedure?

<p>To provide support for a prosthetic eye. (C)</p> Signup and view all the answers

What is the primary purpose of viscoelastics in intraocular surgeries?

<p>To lubricate and support tissues (C)</p> Signup and view all the answers

Which agent is specifically used to constrict pupils during anterior segment surgery?

<p>Miochol (acetylcholine) (D)</p> Signup and view all the answers

What concentration range of epinephrine is considered safe for use with injectable anesthetics?

<p>1:50,000 to 1:200,000 (D)</p> Signup and view all the answers

Which type of drops are utilized to keep the cornea moist during ocular surgery?

<p>Eye irrigation solutions (A)</p> Signup and view all the answers

What is the role of hyaluronidase in relation to local anesthetics?

<p>To enhance the effect of the anesthetic (A)</p> Signup and view all the answers

Which agent is used topically to inhibit scar formation in glaucoma-filtering procedures?

<p>5-Fluorouracil (5-FU) (A)</p> Signup and view all the answers

What is the primary function of the phacoemulsification machine in cataract surgery?

<p>To break up the cataract using ultrasound (B)</p> Signup and view all the answers

What is the use of balanced salt solution during surgical procedures?

<p>To keep the cornea moist and can also contain epinephrine to prevent bleeding (A)</p> Signup and view all the answers

Which type of agent is mannitol in the context of intraocular surgeries?

<p>A hyperosmotic agent (A)</p> Signup and view all the answers

What type of machine is used to perform vitrectomy?

<p>Posterior vitrectomy machine (C)</p> Signup and view all the answers

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Study Notes

Anatomy of the Eye

  • Bony orbit is comprised of seven bones: maxilla, palatine, frontal, sphenoid, zygomatic, ethmoid, lacrimal.
  • The orbit houses the globe, orbital fat, extraocular muscles, nerves, blood vessels, and part of the lacrimal apparatus.
  • Lacrimal glands produce tears that are secreted through ducts to moisten the cornea and wash debris, draining into the nasolacrimal duct.
  • Eyelids contain skin, adnexa (eyelashes), subcutaneous tissue, lymphatics, and muscles.
  • Conjunctiva is a transparent membrane; palpebral portion lines eyelids, while bulbar portion covers the globe.
  • Extraocular muscles facilitate eye movement; consist of four recti (superior, inferior, medial, lateral) and two oblique muscles (superior, inferior).
  • Globe is cushioned in orbit and contains aqueous humor (anterior to lens) and vitreous humor (posterior to lens).

Refractive Apparatus

  • Main components affecting vision include cornea, lens, vitreous humor, and aqueous humor.

Perioperative Nursing Considerations

  • Ophthalmic patients include premature infants to elderly individuals.
  • Patients admitted ambulatory; orientation to surroundings crucial for visually impaired individuals.
  • Surgical positioning often requires a supine position; protocols vary by surgeon and institution.
  • Collaboration with surgical team ensures patient positioning safety, including use of return electrode pads and safety straps.

Instrumentation and Counting

  • Instruments for extra and intraocular surgeries include eye scalpels, scissors, lacrimal probes, and needle drivers.
  • Minor count is essential during ophthalmic procedures for instrument safety.

Eye Pharmacology

  • Medications for surgical procedures include dilating drops (e.g., phenylephrine, atropine) and constricting drops (e.g., Miochol).
  • Viscoelastics lubricate and support tissues during surgery (e.g., sodium hyaluronate).
  • Eye irrigation solutions, like Balanced Salt Solution (BSS), maintain cornea moisture.
  • Hyperosmotic agents (e.g., mannitol) reduce intraocular pressure.
  • Injectable anesthetics are used to manage pain, with lidocaine being common.

Equipment

  • Phacoemulsification machines use ultrasound for cataract removal.
  • Posterior vitrectomy machines facilitate vitreous removal.
  • Cryotherapy machines seal retinal tears.
  • Lasers are employed for various ocular interventions including cataract and retinal surgeries.
  • Operating microscopes enhance visibility during procedures.

Surgical Interventions

Extraocular Surgeries

  • Strabismus surgery corrects ocular misalignment; categories include esotropia, exotropia, hypertropia, and hypotropia.
  • Techniques include recession (weakening) and resection (strengthening) procedures.
  • Enucleation removes the entire eyeball for severe conditions; an implant supports prosthetics.
  • Chalazion removal addresses blockage of meibomian glands; entropion and extropian repairs address eyelid malformations.
  • Pterygium excision removes conjunctival growths on the cornea.

Retinal Surgery

  • Vitreous humor assists in preserving eyeball shape, but can cause floaters as it ages.
  • Increase in floaters may indicate potential retinal detachment.
  • Laser treatment for diabetic retinopathy prevents new vessel formation causing vision loss.
  • Vitrectomy surgery removes opaque vitreous to enhance vision.
  • Pneumatic retinopexy and scleral buckling are techniques to reattach detached retinas.

Intraocular Surgeries

  • Cataract surgery involves removing the opaque lens.
  • Extra Capsular Cataract Extraction (ECCE) carefully removes the lens while leaving the posterior capsule intact.
  • Intra Capsular Cataract Extraction (ICCE) removes the lens within its capsule, typically using a cryoprobe.

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