a. the anterior capsule is 10 times thicker than the posterior 
    capsule

b. the anterior surface has a greater radius of curvature than 
     the posterior surface

c. during accommodation the lens moves towards the cornea

d. the lens is more effective in absorbing light with long than 
    short wave-lengths

e. the lens is supplied by the ophthalmic nerve

Answera.F   b.T   c.T   d.F   e.F
The anterior capsule is about 3 times thicker than the posterior capsule. The anterior capsule measured about 12 um and the posterior 4 um in an adult. The thickness increases with age.
The anterior surface has a radius of curvature of about 10 mm and that of the posterior surface about 6 mm
The lens is more effective at absorbing the short than long wavelengths.
The lens has no innervation.
 

a. prozac

b. simvastatin

c. salicylic acid

d. chlorpromazine

e. PUVA

Answera.F   b.T   c.F   d.T   e.T
 

a. dehydration

b. smoking

c. alcohol

d. poor nutrition

e. ultraviolet light.

Answera.T   b.T   c.T   d.T   e.T
 

a. the potassium concentration is higher than that of the 
    sodium

b. the majority of the lens protein are water soluble

c. glutathione is increased in the presence of cataract

d. production of fructose is increased in the presence of 
    hyperglycaemia

e. the osmolarity is higher than that of the aqueous

Answera.T   b.T   c.T   d.T   e.T
The potassium concentration is 125mmol/l whereas that of sodium is 20mmol/l.
In hyperglycaemia, glucose enter the sorbitol pathway. The sorbitol is then converted to fructose.
 

a. they are water soluble

b. alpha crystallin is the most common 

c. gamma crystallin is the smallest crystallin

d. beta crystallin has the largest mass

e. gamma crystallin is found mainly in the nucleus

Answera.T   b.F   c.T   d.F   e.T
Alpha crystallin has the largest mass and form about 35% of crystallins
Beta crystallin is the most common and accounts for 55% of crystallins
Gamma crystallin has the smallest mass and made up 10% of crystallins
 
 
 
 
 

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