BIO Condensing Lenses:

Power/FOV/Mag/Use

20D: 37-40° (8DD)/2-2.5x/routine exam

28D: 55° (11DD)/ 1.5x/pediatric exam

14D: 25° (5DD)/ 3.5x/diabetic exam

T: 0.5% or 1%

parasympatholytic (blocks sphincter)

Onset: 20-40min

Duration: 6-8hrs

Side Effects: Ocular = inc IOP, cycloplegia, photophobia

Systemic: HA, tachycardia, dry mouth, psychotic reactions

Phenylephrine

PE: 2.5% or 10%

Sympathomimetic (stim dilator)

Onset = 45min

Duration = 6-8hrs

Side Effects: Ocular: pain, lacrimation, keratitis, rebound congestion/miosis

Systemic: cardiovascular effects on Pt taking other sympathomimetics

Hydroxyamphetamine 1% + T 0.25%

combo sympathomimetic/parasympatholytic

Onset = 15 min

Duration = 90min

Dapiprazole HCL 0.5%

mydriolytic agent

Onset = 10min

Recovery = 2 hrs

Side Effects: injection, ptosis, lid erythema, lid edema, chemosis, itching, SPK, corneal edema, brow-ache, blur

1. Posterior Pole = optic disc, arcades, macula
2. Vortex System = ampulla + vortex veins
3. Equator: 14-15mm fr limbus
4. Long Ciliary Nerve: 3 & 9 o'clock
5. Short Ciliary Nerves: 6 & 12 o'clock/throughout
6. Ora Serrata = ora bays + dentate processes (1mm nasal, 2mm temporal; 24DD from fovea)

Non-Contact Fundus Biomicroscopy Lenses

Power/FOV/Mag/Working distance

+90 = 89°/0.76x/7mm

+78 = 84°/0.93x/8mm

+60 = 70°/1.15x/13mm

Hruby Lens: posterior pole

(a) Bullet Mirror: 59°, Anterior (to ora)

(p) Rounded Rectangle: 67°, Periphery

(e) Trapezoidal: 73°, Equator (pp--> eq)

Hruby lens: posterior pole

Mirrors: 62°, 67°, 76°, 80°

Mirror images overlap at edges to reduce need to tilt lens

1. Standard: view pp --> eq; FOV = 90°, Mag = 0.96x
2. Wide Field: pp --> periph; FOV=125°, Mag=0.68x
3. High Field: FOV = 75°, Mag = 1.2x

Some require Celluvisc, unless marked NMR

+100D

FOV = 125°

Mag = 0.5x

+135D

Mag: as CONTACT = 0.75x

NON-CONTACT = 0.54x

+132D

FOV = 86°

Mag = 0.5x

FOV = 125°

Mag = 0.76x

1. Baseline for new Pt
2. (+) Hx of injury/trauma
3. Flashes/Floaters, esp if recent onset/change
4. Unexplained dec in BCVA w/o PH improvement
5. Loss of VF
6. Dense media opacities
   
7. Myopia > 4-5D
8. Miosis
9. Unexplained headaches
   
10. (+) RAPD
11. (+) Hx of systemic disease w/ known ocular effects
12. (+) Hx of meds w/ known ocular effects

LADSS

1. Lens-fixed IOL
2. Angle-closure GLC, risk or presence of
3. Drug allergy
4. Subluxed IOL
5. Subluxed lens