Finding the Best Tonometer for your Practice – IOP in Optometry & Ophthalmology

Finding the Best Tonometer for your Practice – IOP
in Optometry & Ophthalmology
It’s easy to get lost while looking for the Best Tonometer as there are a few tonometry options:
applanation, handheld, desktop, noncontact, airpuff, rebound, indentation, non-corneal, through
the eyelid / transpalpebral, scleral, pen-like tonometers.
There is also a list of manufactures to pick from: HAAG-STREIT, 66Vision, Canon, Cso,
DIATON, Huvitz, Essilor, Icare, Luneau, Kangjie, Keeler, Kowa, Macro, BiCOM, Nidek,
Oculus, Reichert, Rexxam, Rodenstock, Swowei, Tomey, Accutome, Topcon, Ziemer just to
name a few.
Each Tonometry Option has its Benefits, Advantages and Limitations.
Tonometry devices can be broken up to 2 Main Categories:
1. Corneal Tonometry – where intraocular pressure (IOP) is measured by either
indenting or applanating the cornea. Contact with the cornea and numbing drops might be
required with some corneal tonometers (ex: Goldmann, Tonopen) and not others, such as
Airpuff.

2. Non-Corneal or Scleral Tonometry – this innovative tonometry category is
represented by a single brand the Transpalpebral DIATON tonometer. Diaton presents an
innovation due to its technique and ballistic principle, which is based on Newton’s
second law of motions:
F net = m • a
Diaton tonometer allows to measure IOP through the upper eyelid and sclera. Unlike all other
cornea dependent tonometry devices, IOP with Diaton is not influenced by known and still
unknown biometric properties of the cornea. Pachymetry is not required to adjust the readings
for the central corneal thickness (CCT), as with Diaton device, the operating principle and the
technique completely eliminates the influence of the cornea. IOP is measured above the edge of
the limbus, with Diaton tonometers tip placed on the upper eyelid at tarsus and sclera.
Goldmann applanation tonometry (GAT) is the gold standard for measuring IOP and most
probably will continue to be so into the near future. However, its limitations were obvious from
the start and include the substantial effects of several eye variables such as axial length,
curvature, rigidity and corneal thickness. Also, in some eyes, especially those with corneal
problems (such as diseases, trauma, haze, corneal opacities, leucomas, etc.) and surgery, taking
measurements is not easy.
Thus the option of transpalpebral, scleral tonometry with Diaton tonometer makes it a more
versatile tonometry option for practices that already have GAT and are seeking for a handheld,
cornea independent readings.
Non-corneal tonometry methodology was clinically tested at MEEI/Harvard Medical School by
Dr. Mark Latina and colleagues – where Diaton provided a new and unique way of looking at
IOP completely independent of corneal biometrics as the reading with Diaton is done via eyelid
and more importantly the sclera, not through the cornea as all other tonometers.
Tonometer Diaton is the perfect solution in the following cases when the use of other tonometry
devices is problematic or impossible: Keratitis, Conjunctivitis, Keratotone, Cornea Dimness,
Keratoprosthesis, Keratoplastics, LASIK, LASEK, PRK, Astigmatism, Ametropy, etc.,

Product Features & Major Benefits:
• Easy to use. Handheld, portable, pen-like device
• No contact with the cornea (only upper eyelid and sclera)
• No need for anesthesia drops or removal of contact lenses
• Safe: No risk of infecting or scratching cornea
• Cost efficient: No consumables (no need to purchase replacement
tips/covers, etc.)
• No sterilization (just alcohol swab is used to wipe off the tip)
• Accurate: No pachymetry needed (independent of cornea)
• Ready-to-use: Daily calibration not required
Diaton Tonometer in Action:
How to Use Tonometry Over Eyelid with Tonometer DIATON
Video taken at the Academy of Ophthalmology AAO- click image to watch video
Q&A on Benefits and Advantages of Diaton tonometer by Glaucoma and Cornea
specialists from Harvard/MEEI Dr. Mark Latina and Dr. Emil Chynn

Review Diaton tonometer Quick Start Guide:
Find more clinical details, price and order options at
www.TonometerDiaton.com