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, Nidek, Oculus, Reichert, Rexxam, Rodenstock, Swowei, Tomey, Accutome, Topcon, Ziemer just to name a few.
Each tonometry device has its benefits, advantages and limitations.
Tonometry devices can be broken up to 2 Main Categories:
- 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.
- 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:
Fnet = 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
Review Diaton tonometer Quick Start Guide:
Find More clinical details, price and order options at www.TonometerDiaton.com