Custom Soft Lenses (M1) Flashcards
What is the best way to determine the parameters for a custom soft CL?
plug into the SpecialEyes Arc Length Calculator
What are the most important parameters that the custom soft CL’s can customize that other soft CL’s cannot?
- base curve (any 0.1mm steps)
2. diameter (any 0.1mm steps)
What is the replacement schedule of custom soft CL’s?
quarterly (every 3 months)
What is the average HVID?
11.8mm
What are the steps to calculate the effective “K”?
- for every 0.2mm smaller than 11.8mm subtract 1.00D from their mean K
- for every 0.2mm larger than 11.8mm add 1.00D from their mean K
What are the three most important anatomical features in order that contribute to sagittal height?
- corneal diameter
- corneal shape factor
- corneal radius
How much sclera drape should be present in a soft CL on all sides of the lens?
at least 1mm
What should be done before putting the custom soft CL’s into the patients eyes when they first get the CL’s?
rinse thoroughly in solution
If the spherical over refraction of a custom soft lens is not consistent then what is suspected?
- poor fit
- everted lenses
- switched lenses
What are the benefits of doing custom soft CL’s at a practice?
- builds practice
- increase referrals
- locks patient into practice
What are the limitations of LARS to correct lens rotation?
- vertexing errors
- lens draping effects
- cylinder masking
- tear lens effects
- cross cylinder effects
What are the indications for custom soft CL’s?
- custom toric designs
- keratoconus
- post trauma
- post refractive surgery
- aphakia
- high refractive error
- glaucoma
- macro or micro cornea
What are some things that can be done when the vision does not seem right with the soft toric custom lenses?
- over refraction (plug OR into cross cyl calculator)
- over keratometry (look for clear mires)
- assess rotation
Are custom soft lenses usually silicone or hydrogel material? 1. Why? 2
- hydrogel
2. easier to lathe cut
