Flashcards in Objective 4 Deck (17):
What must be used in conjunction with Schirmer’s test # 2 to assist in producing accurate results?
a topical anesthetic
Fluorescein and the cobalt filter allow the practitioner to assess the fit of an RGP contact lens when used in conjunction with what slit lamp illumination?
What is the reason a fitter should ensure that fluorescein not come in contact with a patient’s clothing?
fluorescein permanently stains
What are two advantages of the Burton Lamp over a slit lamp?
portability and larger viewing area
What food color dye produces the same results as Rose Bengal without stinging?
What is Schirmer’s test used to measure?
quantity of tears
What filter is placed in front of the observation system and not the illumination system to assist in fluorescein pattern evaluation?
Wratten (yellow) filter
What is the most commonly used dye in contact lens fitting?
What is the bacterium that can contaminate opened bottles of liquid fluorescein and cause a devastating infection if the epithelium is compromised?
What red dye stains mucus and dead cells?
What filters are used in the evaluation of tear film and to prevent the passing of light from a specific angle?
What filter is used to view neovascularization?
Red free (green)
What does a break-up-time test measure?
A break-up-time of less than how many seconds indicates an abnormal tear film and is an indication of potential problems with contact lens wear, particularly soft lenses?
What is the most commonly used filter?
Cobalt blue or Ultraviolet
With a lower B.U.T. (tear break up time), what kind of material should be used?
a more rigid material should be considered.