CP.O & S.trabismus

Question 1

Normal newborn axial length

Answer 1

14.5-15.5 mm

Question 2

Newborn corneal horizontal diameter

Answer 2

9.5-10.5 mm

Question 3

Newborn K value

Answer 3

52D

Question 4

What is the 1st phase of axial length development?

Answer 4

Pediod of rapid growth from birth to 2y/o
4mm inc in first 6 mos
2mm inc in next 6 mos

Question 5

When does the 2nd phase of axial length development take place?

Answer 5

2-5 y/o (slower growth)

Question 6

When does the 3rd phase of axial length development take place?

Answer 6

5-13 y/o

about 1 mm

Question 7

Increase or decrease in growth?
AL:
K:
Corneal diameter:
Thickness:
Power:

Answer 7

Increase or decrease in growth?
AL: Increase
K: Decrease
Corneal diameter: Increase
Thickness: Decrease
Power: Decrease

Question 8

Describe the changes in the refractive state of the eye during development.

Answer 8

At birth - hyperopic
At 7 y/o - more hyperopic
16 y/o - myopic shift towards plano

Question 9

Refers to the process in the developing eye in which the refractive power of the anterior segment and the AL of the eye adjust to achieve emmetropia

Answer 9

Emmetropization

Question 10

If a patient is myopic at ___ years, there’s a high risk for progression to myopia > 6D.

Answer 10

10

Question 11

True or False

Astigmatism is common in infants but it regresses

Answer 11

False

Question 12

True or false (during growth of the eye)

The orbital volume increases and the shape of the orbital opening becomes less circular (horizontal oval)

Answer 12

True

Question 13

True or false (during growth of the eye)

The lacrimal fossa becomes deeper, and the angle formed by the axes of the 2 orbits become more divergent.

Answer 13

FALSE!

The lacrimal fossa becomes shallower, and the angle formed by the axes of the 2 orbits become less divergent.