Cataract Surgery, Phakic and Pseudophakic IOLs (F) Flashcards
How many people have catracts over the age of 40 in the US? 1. What were the 2011 costs for cataracts in the US? 2
- 22 million
2. $6.8 billion
What are the qualifications for cataract surgery to be performed?
- BCVA around 20/40
- glare acuity of 20/50
- quality of life affected
What are the preoperative measurements taken prior to cataract surgery?
pupil diameter, AC depth, lens and cornea thickness
What are the important factors to determining lens powers for cataract surgery?
- corneal power
- axial length
- postop AC depth
What is the only proven way to help limit PCO’s?
using square edged lens material
What do spherical monofocal IOLs lead to?
inherent spherical aberrations (inc depth of focus)
What is the approx amount of spherical aberration from the cornea?
+0.27 μm
What are the most popular IOLs currently?
- AcrySof
2. Tecnis
How is the IOL positioned by the surgeon in the eye?
slightly nasal while being aware of cyclotorsion while lying down
What is intraoperative wavefront aberrometry good for?
post LASIK
What are the types of multifocal IOLs?
- refractive
- diffractive
- accommodating
What is the major advantage of accommodating IOLs vs other multifocal IOLs?
less dysphotopsia
What are the most common diffractive multifocal IOLs (are they pupil dependent or independent)?
- Tecnis AMO (pupil independent)
2. ReSTOR Alcon (pupil dependent)
What percentage of patients get PCOs 2 to 5 years after surgery?
20 to 40% and higher in younger people
What is the procedure in which an IOL is placed between the iris and lens? 1. What is the indication? 2. How much should the vault be? 3
- implantable collamer lens
- high myopia
- 300μm or more
