Presbyopia

Question 1

What are the two main principles of presbylasik?

Answer 1

Central presbylasik i.e. centre near e.g. Surpacor and presbymax
Peripheral presbylasik - increases negative asphericity therefore increased depth of focus, combined with some element of monovision e.g. presbyond, Nidek PAC

Question 2

What are the issues with presbylasik?

Answer 2

Adaptation
Loss of distance v/a
Loss of contrast
Glare
More sensitive to dry eye fluctuations

Question 3

How does the flexivue corneal inlay work?

Answer 3

Central clear portion with peripheral near refractive zone. Peripheral zone gives up to 3.5 Add

Question 4

What are the advantages of a corneal inlay?

Answer 4

Rapid return to function

Reversible

Question 5

Is conductive keratoplasty binocular or monocular treatment?

Answer 5

Monocular

Question 6

How does CK work?

Answer 6

Induces centrally steepening

Question 7

What are the risks of CK?

Answer 7

FB sensation
Regression - very common
Focal necrosis
Induced astigmatism
Corneal perforation

Question 8

What are the advantages of accommodating implants?

Answer 8

Less risk of haloes and glare as monofocal

Can be used with other co-morbidities

Question 9

What are the disadvantages of accommodating implants?

Answer 9

They are less predictable/reliable for near vision.

Question 10

How does the symfony lens work?

Answer 10

Increased spherical aberration to increase depth of focus