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
