Optical coupling gel for eye imaging
View Patent ↗The invention discloses an optical coupling gel that has a set of desired features for application in eye imaging, including being approved for eye contact, optically transparent, able to maintain normal hydration of the ocular surface, flexible and capable of maintaining a distinct shape, minimal in breakdown/change during use, and easily dispensable/applicable. In one embodiment, the gel is made of Sodium Carboxy Methylcellulose (SCMC), where the amount of the cellulose determines the viscosity of the gel for its particular application. The right amount of gel is contained in an applicator for application to one or two eyes.
1. A method comprising:
dispensing an optically transmissive gel, having a maintainable shape that conforms to the surface of a lens being part of an ophthalmic examination instrument, to the surface of the lens without the formation of significant air bubbles that would decrease the transmission of light through the optically transmissive gel, with the optically transmissive gel having a concentration of sodium carboxy methylcellulose (SCMC) of between about 4% and 6% in distilled water;
positioning the lens close enough to the surface of an eye under examination so that the optically transmissive gel bridges the gap between the lens and the surface of the eye under examination; and
adjusting the object distance between the lens and the surface of the eye within the range of from about 1 mm to about 7 mm while performing anterior chamber angle imaging of the eye under examination and optical coupling is maintained between the lens and the surface of the eye under examination by the optically transmissive gel to facilitate acquiring good images of the anterior chamber of the eye under examination;
where the viscosity level of the optically transmissive gel allows the optically transmissive gel to be dispensed without formation of significant light-scattering air bubbles and to remain on the lens during positioning, to maintain a defined shape with minimal breakdown or change during use and to be easily removed from the surface of the eye after use.
2. The method of claim 1 where the optically transmissive gel includes specific pharmaceutical components such as anesthetics, antibiotics or fluorescent dyes.
3. The method of claim 1 further comprising:
dispensing the gel with an applicator.
4. The method of claim 1 where the transmissive gel is formed in a mold, packaged and applied to the lens with its shape maintained for a particular use.