September 2016
Volume 57, Issue 12
Open Access
ARVO Annual Meeting Abstract  |   September 2016
Measurement of the retention time of different ophthalmic formulations with ultra-high resolution Optical Coherence Tomography
Author Affiliations & Notes
  • Roberta Amato
    Ophthalmology, Neurovisual Science Technology, Catania, Italy
  • Caterina Gagliano
    Ophthalmology, Neurovisual Science Technology, Catania, Italy
  • Giulia Malaguarnera
    Pharmacology, University of Catania, Catania, Italy
  • Michele Reibaldi
    Ophthalmology, Catania University, Catania, Italy
  • Antonio Longo
    Ophthalmology, Catania University, Catania, Italy
  • Vincenzo Papa
    SIFI SPA, Catania, Italy
  • Footnotes
    Commercial Relationships   Roberta Amato, None; Caterina Gagliano, None; Giulia Malaguarnera, None; Michele Reibaldi, None; Antonio Longo, None; Vincenzo Papa, SIFI SPA (E)
  • Footnotes
    Support  None
Investigative Ophthalmology & Visual Science September 2016, Vol.57, 5727. doi:
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      Roberta Amato, Caterina Gagliano, Giulia Malaguarnera, Michele Reibaldi, Antonio Longo, Vincenzo Papa; Measurement of the retention time of different ophthalmic formulations with ultra-high resolution Optical Coherence Tomography. Invest. Ophthalmol. Vis. Sci. 2016;57(12):5727.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose : The aim of this study was to compare the precorneal retention time of two different formulations (eye drops and eye gel) of the same fixed steroid-antibiotic combination (FC) containing 0.1% dexamethasone and 0.3% netilmicin by using optical coherence tomography (OCT).

Methods : The study was performed in 16 (healthy) subjects age between 14 and 78 years (mean 46,68±SD18,75; 11 females, 5 males). One eye of each subject randomly received a single dose of the FC (Netildex, SIFI, Italy)formulated as eye drop and the fellow eye received a single dose of the same product formulated as eye gel. Evaluation was performed using an ultra-high resolution anterior segment spectral domain OCT (Optovue). Central tear film thickness (CTFT) was measured before instillation (T 0) and then immediately after instillation after 2 blinking (T1) and the every 10 min for 1 h (T2 to T7) and finally after 2 h (T8). The precorneal retention time was calculated by plotting CTFT in function of time. Differences between time points and groups were analysed by Student’s t test.

Results : Baseline CTFT was 516±33 and 518±30 μm (mean ± SD) in the eyes to be treated with eye gel and eye drops, respectively. Only the eye gel was able to increase significantly CTFT (p<0.001). The maximum effect was observed immediately after instillation (T1=532±35 μm), then reduced progressively returning to the baseline values 60 min (T7) after instillation. By contrast the instillation of eye drops was not capable to increase CTFT. Differences between two formulations were statistically significant after instillation (T1, p<0.0001), at 10 min (T2, p<0.001) and at 20 min (T3, p<0.01).

Conclusions : These data indicate that a single instillation of the FC formulated as eye gel has a longer precorneal retention time than the corresponding eye drop solution. The presence of the polymer xanthan gum in the eye gel formulation may explain such results. In addition the study confirms that an ultra-high resolution anterior segment spectral domain OCT may be a useful tool for measuring precorneal residence time of any compounds on the ocular surface.

This is an abstract that was submitted for the 2016 ARVO Annual Meeting, held in Seattle, Wash., May 1-5, 2016.

 

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