Abstract
Purpose :
When using a contact type fundus camera for infants with poor general condition, there are some cases in which vital signs are disturbed by ocular compression. Therefore, we created a non-contact type camera using a portable slit lamp. We show practicality and versatility of this equipment.
Methods :
We fixed the original attachment containing a front lens (Super VitreoFundus or SuperPupil XL, Volk), polarizing plates (to reduce reflected light), and a barrier filter (to cut the blue excitation light in fluorescein angiography [FA]) to a portable slit lamp (SL-17, Kowa Ltd.). We also fixed an iPhone6s (Apple) to the eyepiece of the slit lamp. All images were captured from video data recorded using FiLMiC Pro v6 (Cinegenix) or taken by Apple's camera application.
Results :
Case 1 is a female infant with 36 weeks of postmenstrual age who developed retinopathy of prematurity. Although her general condition was unstable due to circulatory and pulmonary dysfunctions, we were able to photograph her fundus without disturbing vital signs using our instrument. Case 2 is a 3-month-old female with persistent fetal vasculature. Because our camera is also capable to capture the slit-lamp photograph of the anterior segment, we could record the image of the proliferating tissue in contact with the posterior surface of the crystalline lens. Our camera was possible to record images of the peripheral area more than the contact type camera. Furthermore, our camera was able to capture ocular fundus of mice. It was impossible to photograph FA images in human patients, because the amount of blue excitation light which the slit lamp has originally was insufficient. However, FA images were possible to be taken in mice.
Conclusions :
We developed a new instrument to photograph the fundus and FA images. Our instrument has versatility, and it can be used for clinical examinations and basic experiments.
This abstract was presented at the 2019 ARVO Annual Meeting, held in Vancouver, Canada, April 28 - May 2, 2019.