PPO 5 BIO 1

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  1. Primary function of DFE
    Eval peripheral retina for rhegmatogenous (retinal detachment) conditions

    These are missed w/ direct/indirect monocular
  2. Adv of BIO? 2 main ones
    Quick assessment of ENTIRE retina & vitreous; helpful in pediatric/challenging Pts

    Stereoscopic exam - high resolution, binocular, large FOV, unaffected by Pts refractive error
  3. Disadv. of BIO? 3 main reasons
    • 1)Low mag (SLEx & direct)
    • -3x w/ 20D; not reccommended to move closer to Pt to inc mag

    2) Very bright

    3) Requires dilation
  4. Indications of BIO. 4 main ones
    • Every Pts needs one, esp
    • Flashes/Floaters complaints
    • High Myopia >4.00D
    • Systemic Dz: DM, HTN, Lupus, Sickle Cell Anemia, Sarcoidosis, HIV/AIDs, Cancer
  5. Contraindication of BIO
    Narrow angles due to angular closure 2ndary to pupil dilation.

    Caution w/ Tropicamide. Sensitive Down Syndrome Pts.
  6. Dilation at 4pm Friday?
    Hellz to the NO! danger period is 2-4 hrs and most Ophthalmologist offices are closed.
  7. Dilation of Questionable Angles procedures and cautions
    • Check IOP 45-60mins after instillation.
    • Rise in IOP might be an ascending spike.
    • IOP pressures will be highest at mid-dilation (1-2 hrs post dilation)
  8. Tropicamide. %'s, eye color correction, does what? Generic names.
    • 1% for brown eyes
    • 0.5% for blue/green eyes

    Is an Anticholinergic drug that blocks sphincter mm of iris -> dilation & moderate cycloplegia

    Generic names: Tropicacyl & Spectro-Cyl
  9. Phenylephrine.
    %'s, does what?, Brand names.
    • 2.5% and 10%
    • Sympathomimetic drug for mydriasis & vasoconstrictor

    Brand names: Ak-Dilate, Mydfrin, Neo-synephrine, Neofrin
  10. Name the 3 drugs used for dilation in order.
    • 1) Proparacaine;  anesthetic
    • 2) Phenylephrine 2.5%;  mydriasis/penetration
    • 3) Tropicamide;  disables sphincter
  11. 2.5% Phenylephrine
    Attributes, benefits over 10%
    • 2.5% Phenylephrine HCL is weak and slow-acting mydriatic drug.
    • Does NOT induce blur.
    • Less systemic risk than 10%
    • Cannot be used as a dilator alone.
  12. Side effects of Tropicamide and Phenylephrine

    Head, heart, skin etc etc
    • Trop: Stings
    • Caution w/ overdosing kids
    • OD includes: headache, tachycardia, dry mouth/skin, unusual drowsiness, warm/redness of skin
    • Blurred Vision @ near
    • photophobia

    • Phenylephrine: Dizziness, fast/irregular/pounding heartbeat, inc sweating, inc BP, paleness, trembling
    • High BP b/c vasoconstrictor properties esp for HTN Pts on 10% str. P.
  13. Condensing lens: Increasing dioptic power will?

    What lenses can be used?
    • Inc FOV
    • Dec Mag
    • dec Working Distance

    • 14D, 20D, 25D, 28D, 2.2 pan-retinal
    • 20D is best of both worlds.
    • 2.2pan0retinal is 25.5D, similar to 20D
  14. Mag of condensing lenses
    20D = ?
    30D = ?
    15D = ?
    "2.2" = ?
    • 20D = 3x
    • 30D = 2x
    • 15D = 4x
    • "2.2" (25.5D)= 2.5x
  15. DD (disc Diameter) of 20D Lens w/ BIO?
    DD of direct ophthalmascope?
    • ~8DD BIO
    • ~2DD Direct
  16. When tombonering, dist from lens to examiner is approx...?
    Only works for which part of the retina?
    ...16-20 in"

    Posterior pole & mid-periphery
  17. When examining the retina how many peripheral and posterior views are there?
    8 peripheral, 4 pole
  18. Retina is divided into 3 concentric circles. What are they defined by?
    • Inner = equator (4 vortex veins)
    • Middle = ora serrata
    • Outer = ciliary process

Card Set Information

Author:
sbkenbs
ID:
191972
Filename:
PPO 5 BIO 1
Updated:
2013-01-10 03:01:41
Tags:
PPO BIO
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Description:
Binocular indirect opthalmoscopy
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