Optics and Refractive Errors

Question 1

When does axial lengthening occur?

Answer 1

Most occurs in the first 3-6 months of life

Question 2

How is the axial ‘length’ of the eye measured?

Answer 2

From the corneal surface to the retinal pigment epithelium(RPE) / bruch membrane.

Question 3

What is the normal axial length in adults?

What is the normal lens to retina length in adults?

Answer 3

Axial - 24mm

17 mm

Question 4

Define Myopia:

Answer 4

This is when the focus of light occurs before reaching the retina. (short sightedness)