IOLs
What type of IOL should be avoided in patients with silicone oil in the eye or who may have silicone oil later on?
Silicone lens
What is the minimal acceptable difference in axial length between the two eyes?
0.3mm
List three risks of retrobulbar anesthesia
retrobulbar hemorrhage, optic nerve injury, globe penetration, EOM toxicity, inadvertent IV injection, inadvertent intradural injection
What is an advantage of a square-edge IOL? Bonus +200: What would be an advantage of round-edge IOL?
Reduced rates of PCO
Decreased rates of dysphotopsias
If a surgeon chooses to place a 3-piece IOL in the sulcus with optic capture, how should he/she adjust the power of the IOL from the original power chosen?
No adjustment necessary, IOL is still in the bag
What is used to promote sterilization prior to starting cataract surgery?
5% povidone-iodine SOLUTION in the eye and 10% around the eye
Explain monovision, including the refractive goals of each eye and which eye is set for which refractive power
Mini-monivision is -0.50 ro -1.50D, while full monovision is -1.50 to -2.50D
List the 5 spikes in an A-scan. Bonus +100: What is something that a patient could have in the eye that could cause the AL to be falsely large?
1. Cornea/probe
2. Anterior lens
3. Posteiror lens
4. Retina
5.Choroid/sclera
Silicone oil
What two intracameral antibiotics are most popular in the US?
Bonus +100: Intracameral is no longer used because of what complication?
Moxifloxacin, cefuroxime
Hemorrhagic occlusive retinal vasculitis (HORV)
What does it mean that an IOL is aspheric and why is this a good thing?
The lens is not perfectly spherical. They have negative spherical aberration, which counteracts the positive spherical aberrations (higher order aberration)
If a surgeon initially chose to use a +29.00D in-the-bag IOL, but then decided to put a lens in the sulcus, what adjustment should be made to the IOL power?
Subtract -1.50D (+27.50D)
Cohesive OVDs have (long/short) chains, (high/low) molecular weight, (high/low) viscosity, (high/low) surface tension
long, high, high, high
What is the difference in a multifocal IOL and an EDOF IOL?
MFIOL: achieve distance/intermediate/near vision by dividing light into 2 or more focal points
EDOF: Creates an elongated focal range from distance through intermediate, but no near
List the main difference between corneal topography and corneal tomography
Bonus +200: What is the other name for tomogrsphy?
Topography: Measures anterior corneal surface with palcido disk-based technology
Tomography: Anterior AND posterior cornea curvature is measured
Scheimpflug imaging
List the three components of OVDs
1. Sodium hyaluronate
2. Chondroitin sulfate
3. Hydroxylpropyl methylcellulose (HPMC)