Slit Lamp Bio-microscopy from contact Lenses -CSB Flashcards
What does it mean to be therapeutic?
Relating to the healing of disease.
What is Aphakia?
Aphakia is the absence of the crystalline lens of the eye
For myopes is visual acuity improved or decreased when comparing contacts to glasses?
Contact lenses provide a higher visual acuity for myopes than glasses
Why may acuity be decreased (when compared to glasses) for hyperopes when contact lenses are worn?
There is a possibility that the decreased acuity is due to decreased magnification and fluctuating accommodation.
How are slit lamps used in regards to Contact Lens Prescribing?
They are used in a contact lens fitting for baseline measurements and aftercare to check for lens fit, surface condition and ocular integrity.
What are concretions?
Little vacuoles or cysts filled with lipid
What are high, low and medium magnifications on a slit lamp used to look at in regards to the eye?
– Low 6-10x for general eye – Medium 16x for structures – High 25-40x for detail
What would low magnification on a slit lamp be used to look for?
- Lids/lashes • Cornea • Conjunctiva • Sclera
What would medium magnification on a slit lamp be used to look for in regards to Contact Lens Prescribing?
-Blepharitis • Meibomian gland dysfunction • Concretions • Corneal staining
What would medium magnification on a slit lamp be used to look for in regards to Contact Lens Prescribing?
-Epithelial changes • Stromal striae and folds • Endothelial folds, blebs, and polymegethism
What is your responsibility if you find any sign of corneal hypoxia in a contact lens patient?
Take the contact lens out. Not allow the patient to wear any lenses until the problem goes away and teach the patient about proper contact lens care.
What are Stromal Striae?
Fine grayish white lines in the corneal stroma. These represent localized separations of the highly ordered collagen
What are Stromal Folds?
More advanced striae where fluids have caused localized undulations (up and down outlines) or wrinkles in the cornea.
What do Stromal Striae lead to?
Stromal Folds
When are Stromal Striae or Folds present?
When corneal oedema is occuring.
What effect do corneal Straie or folds have?
They cause a loss of vision. (milky cornea).