Original Reports
Application of an Autokeratometer in Dogs
1998 Volume 17 Issue 1-2 Pages 1-2_17-1-2_22
Details
1998 Volume 17 Issue 1-2 Pages 1-2_17-1-2_22
Corneal base-curve in dogs has been so far measured by an Ophthalmometer. Corneal base-curve, however, can be measured only under the conditions where an refracted image on cornea is projected to the central cornea and the proper restraint is carried out on the dog to held its cornea steadily and continuously. Therefore the measurement by an Ophthalmometer should be conducted under general anesthesia. A handy type Autokeratometer has been recently developed which can measure a corneal base-curve within 0.1 second. Then we examined the correlation between the corneal base-curves measured by an Ophthalmometer and an Autokeratometer.
The eyes of six healthy adult mixed-breeding dogs, three healthy adult Japanese Shiba Inus and ten Siberian Huskies were used. Corneal base-curves (represented by the lengths of the horizontal direction and the vertical direction) were measured by Autokeratometer (Nidek KM-500) at first before anesthesia. And then they were also measured by Opthalmometer (Inami L-1050) and the Autokeratometer under general anesthesia with xlyasine and ketamine hydrochloride.
The coefficients of correlation between the corneal base-curves measured by the Ophthalmometer and the Autokeratometer under general anesthesia are 0.64 for the vertical direction and 0.51 for the horizontal direction, respectively indicating that the higher correlation was show on the vertical direction. The coefficients of correlation between the corneal base-curves measured by the Ophthalmometer under general anesthesia and the Autokeratometer under non-anesthesia are 0.52 for the vertical direction and 0.28 for the horizontal direction, respectively. A significant variation was shown with the vertical values. Both the horizontal and vertical corneal base-curves measured by the Autokeratometer under anesthesia and non-anesthesia showed no fluctuations on their values.
Therefore, an Autokeratometer can be adopted to measure the corneal base-curves without general anesthesia in dogs.
