Exam 1 Remington- Cornea Flashcards Preview

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Flashcards in Exam 1 Remington- Cornea Deck (123)
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1

What are the two functions of the cornea?

Transmission and Refraction

2

What is refraction of the cornea dependent on?

Curvatures, length, different indices

3

Anterior diameter of the cornea

12 mm horizontal, 11 mm vertical

4

Posterior diameter of the cornea

Horizontal and vertical diameters of 11.7 mm, sclera impinges inferiorly into cornea

5

Central thickness of the cornea

0.53 mm

6

Peripheral thickness of the cornea

0.71 mm

7

Anterior radius of curvature of the cornea

7.8 mm

8

Posterior radius of curvature of the cornea

6.5 mm

9

_____ radius of curvature means a steeper curve

Shorter

10

What is regular astigmatism?

Principle meridians 90 degrees apart

11

What are 3 types of regular astigmatism?

WTR, ATR, and oblique

12

What is WTR astigmatism?

Vertical meridian is steepest (shortest radius of curvature) think football

13

What is ATR astigmatism?

Horizontal meridian is steepest

14

What is oblique astigmatism?

Steepest meridian at 45 or 135 degrees

15

What is irregular astigmatism?

Principle meridians are not 90 degrees apart

16

How is irregular astigmatism corrected?

Contact lenses

17

What is the function of the plasma membrane lipid bilayer?

Controls molecular entrance and exit

18

What is the function of the cytoskeleton?

Structure and intercellular transport

19

What is the function of ribosomes?

Manufactures protein

20

What is the function of the endoplasmic reticulum?

Protein/lipid synthesis

21

What is the function of the Golgi apparatus?

Package proteins

22

3 types of cellular transport

Diffusion, facilitated diffusion, active transport

23

What do aquaporins do?

Move water

24

What type of channels are aquaporins?

Bidirectional in the cornea and lens

25

3 types of cell surfaces

Apical, lateral, and basal

26

What is a basal cell surface?

Sits on basement membrane, connective tissue

27

The basement membrane consists of what 2 types of lamina?

Basal and reticular

28

Basal lamina is secreted by what cell?

Epithelial

29

Reticular lamina secreted by what cell?

CT layer

30

What are the 2 shapes of intercellular junctions?

Zonular and macular