PPO 5 BIO 1
Card Set Information
PPO 5 BIO 1
Binocular indirect opthalmoscopy
Primary function of DFE
Eval peripheral retina for rhegmatogenous (retinal detachment) conditions
These are missed w/ direct/indirect monocular
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
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
Indications of BIO. 4 main ones
Every Pts needs one, esp
High Myopia >4.00D
: DM, HTN, Lupus, Sickle Cell Anemia, Sarcoidosis, HIV/AIDs, Cancer
Contraindication of BIO
Narrow angles due to angular closure 2ndary to pupil dilation.
Caution w/ Tropicamide. Sensitive Down Syndrome Pts.
Dilation at 4pm Friday?
Hellz to the NO! danger period is 2-4 hrs and most Ophthalmologist offices are closed.
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)
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
%'s, does what?, Brand names.
2.5% and 10%
Sympathomimetic drug for mydriasis & vasoconstrictor
Brand names: Ak-Dilate, Mydfrin, Neo-synephrine, Neofrin
Name the 3 drugs used for dilation in order.
1) Proparacaine; anesthetic
2) Phenylephrine 2.5%; mydriasis/penetration
3) Tropicamide; disables sphincter
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.
Side effects of Tropicamide and Phenylephrine
Head, heart, skin etc etc
Caution w/ overdosing kids
: headache, tachycardia, dry mouth/skin, unusual drowsiness, warm/redness of skin
Blurred Vision @ near
: 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.
Condensing lens: Increasing dioptic power will?
What lenses can be used?
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
Mag of condensing lenses
20D = ?
30D = ?
15D = ?
"2.2" = ?
20D = 3x
30D = 2x
15D = 4x
"2.2" (25.5D)= 2.5x
DD (disc Diameter) of 20D Lens w/ BIO?
DD of direct ophthalmascope?
When tombonering, dist from lens to examiner is approx...?
Only works for which part of the retina?
Posterior pole & mid-periphery
When examining the retina how many peripheral and posterior views are there?
8 peripheral, 4 pole
Retina is divided into 3 concentric circles. What are they defined by?
Inner = equator (4 vortex veins)
Middle = ora serrata
Outer = ciliary process