| 摘要 |
A measurement apparatus designed to be used in association with the housing supporting an indirect ophthalmoscopy optical system is shown. The optical system may include one or more lens elements contributing to the formation of an aerial fundus image. Exact positioning of the lens elements as well as consistent lens housing dimensions insure accurate location of the aerial image relative to an examined eye. Such positioning may be accomplished by means of a contact lens of given thickness and power, in predetermined relationship with the image forming lens(es), or by means of an adapter positioned on the external eyelid of a patient, with the image forming lens(es) supported therein. A reticle is formed on a transparent disc of glass or other material, and is fitted into a supporting structure which is adapted to be selectively retained in association with the housing of the indirect ophthalmoscopy optical system. The reticle may be manually positioned at a location which coincides with the formed aerial image of the optical system, thus allowing quantitative measurement of interior portions of the eye as represented in the aerial image. The position of the supporting structure for the reticle is adjustable to accommodate for any shifting of the image plane created by specific refractive conditions of the examined eye.
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