Sunday, September 18, 2005

Chapter 1 Assessment - Types of Cataracts

Classic Types of Cataract


CLICK ON TABLE FOR LARGER SIZE

Nuclear Cataract

Epidemiology / Risk Factors

  • Age
  • Riboflavin, vitamin C, vitamin E and carotene may decrease risk of nuclear sclerosis
  • Cigarette smoking increase the risk of nuclear sclerosis


Symptoms / History

  • Gradual progressive loss of vision
  • Second sight -- development of myopia due to increased lenticular refractive index
  • Monocular diplopia
  • Decreased color discrimination especially blue

Clinical features

  • Central yellow to brown discoloration of the lens
  • Myopic shift
  • Bilateral
  • Decreased penetration of cobalt blue slit beam through lens

Posterior Sub-Capsular Plaque (PSCP)

Epidemiology/Risk Factors

  • Younger patients than with nuclear or cortical cataracts
  • Diabetes mellitus
  • Radiation
  • Corticosteroids
  • Uveitis and retinitis pigmentosa
  • Smoking


Symptoms/history

  • Progressive loss of vision, sometimes rapid
  • Glare, halos
  • Monocular diplopia


Clinical features

  • Axial opacity of the posterior cortical material that initially has an iridescent sheen and appears in the posterior cortex that is followed by granular and plaque like opacities.
  • Can be confused with posterior polar cataract and mittendorf dot
  • Can see with direct but best viewed with red reflex through slit lamp

CLICK ON IMAGE FOR LARGER SIZE

Cortical Cataract

Epidemiology/Risk Factors

  • Younger patients than with nuclear cataracts
  • Diabetes mellitus
  • Sunlight
  • Trauma
  • Smoking


Symptoms/history

  • Progressive loss of vision, sometimes rapid
  • Glare, halos
  • Monocular diplopia


Clinical features

  • Opacity of the cortical fibers from posterior to central
  • Sometimes wedge shaped forming cortical spokes
  • Can progress to intumescent or hypermature cataract
  • Usually medial and inferior from UV exposure

CLICK ON IMAGE FOR LARGER SIZE

[PREVIOUS] [NEXT]

0 Comments:

Post a Comment

Links to this post:

Create a Link

<< Home