The Triggerfish Lens and Glaucoma Monitoring

1
The Triggerfish Lens and Glaucoma Monitoring

• By Samuel Karnes

2
Glaucoma

• Intraocular pressure on the optic nerve
• Blindness
• Four types
• Chronic (open angle)
• Angle Closure (acute)
• Congenital
• Secondary

3
Triggerfish Lens

• Sensimed AG
• Strain gauges
• around the outer edge
• Micro-processor
• Antenna
• Radiofrequency waves
• Bluetooth

4
Current Glaucoma Tests

• Tonometry Procedures
• Eye is numbed with numbing drops
• Slit-lamp is moved forward until tonometer
  touches the eye
• Handheld device touches the eye and takes
  pressure reading
• Pressure is read from change in light reflections
  when air hits the eye (Air Puff)
• Each procedure only reads IOP for a few seconds

5
Advantages

• 24 hour IOP monitoring
• Silicon hydrogel (used for regular contact lens)
• Easy to wear
• Non-Invasive

6
Disadvantages

• Not available in U.S. currently
• Each lens only provides a single use
• Common adverse effects
• Eye irritation
• Blurred vision

7
Testing Results

• Effective results for 36 of 40 patients
• 82 blurred vision
• 80 inflammation and reddening of the eye
• Symptoms usually went away within 24 hours

8
Conclusion

• Lens collects more data than current tests
• Seconds of monitoring vs. hours
• Long term
• More accurate diagnoses
• Better information for finding a possible cure

9
Questions?
10
Refrences

• 1 Gravitz, Lauren. "Mobile Computing Is Just
  Getting Started." MIT Technology Review. MIT, 31
  Mar. 2010. Web. lthttp//www.technologyreview.com/n
  ews/418247/glaucoma-test-in-a-contact-lens/gt.
• 2 Haughton, Alison N. "Tonometry." Health
  Facts. Ebsco, n.d. Web. lthttp//www.beliefnet.com/
  healthandhealing/getcontent.aspx?cid100915gt.
• 3 "Sensimed Triggerfish." Sensimed Triggerfish
  Sensimed. Sensimed AG, 2013. Web.
  lthttp//www.sensimed.ch/en/products/sensimed-trigg
  erfishr.htmlgt.
• 4 "Contact Lens Measures Intraocular Pressure."
  Contact Lens Headlines RSS. Access Media Group
  LLC, 11 Feb. 2011. Web. lthttp//www.contactlenshea
  dlines.com/6447/triggerfish/gt.
• 5 Gever, John. "Contact Lens Promising in
  Glaucoma." Contact Lens Promising in Glaucoma.
  MedPage Today, 13 Aug. 2012. Web.
  lthttp//www.medpagetoday.com/Ophthalmology/Glaucom
  a/34180gt.
• 6 "Glaucoma." Glaucoma. U.S. National Library
  of Medicine, 14 Sept. 2011. Web.
  lthttp//www.ncbi.nlm.nih.gov/pubmedhealth/PMH00025
  87/gt.