PubMed · 1242925
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D Friedburg, U Aengenheyster. 1975. [Iris changes in glaucoma].. https://pubmed.ncbi.nlm.nih.gov/1242925/
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Ophthalmic examinations were performed for determining the suitability of seven different types of non-ophthalmic ultrasound equipments for ophthalmological purposes. According to the results, the instruments with probes of 5 MHz or higher frequency are appropriate for certain screening ophthalmological purposes in hospitals where ophthalmic ultrasound instrument is still missing. The possible indications are: approximate estimation of axial eye length for intraocular lens calculation, and visualization of gross intraocular and orbital diseases, such as retinal detachment, tumours, foreign bodies etc. In case of pathological result or in case of axial eye length different from the average value, the high resolution ophthalmological ultrasound examination is mandatory. The modern colour-coded Doppler ultrasound equipments were found suitable for the examination of the circulation of the eye and orbit.
Thirty-two intraocular lesions were studied with magnetic resonance (MR) imaging and computed tomography (CT). These lesions included retinoblastoma (n = 11), uveal melanoma (n = 6), metastatic choroidal tumor (n = 3), choroidal hemangioma (n = 2), retinochoroiditis (n = 6) and Coats' disease (n = 4). MR imaging was superior to CT in the depiction of intraocular masses and retinal detachment. Gd-DTPA enhanced MR imaging was more useful than contrast enhanced CT in evaluating the contrast enhancement of intraocular tumors. Differential diagnosis of intraocular tumors was difficult with both MR imaging and CT. Intratumoral calcification was noticed on CT in nine cases of retinoblastoma. It was concluded that MR imaging, including contrast enhancement study, is more useful than CT in the evaluation of intraocular lesions, except for calcification, and contrast enhanced CT may be unnecessary in the diagnosis of intraocular lesions.
Monochromatic light accentuates details of different retinal layers because of its variable absorption and reflectance by structures both within and above these layers. Monochromatic photography was used to examine macular vitreoretinal interface abnormalities in 19 patients. Short wavelength photographs (490 nm) provided the best detail of inner retinal abnormalities, including epiretinal membranes, vitreoretinal traction, and the internal surface of confluent macular edema (pseudocyst). Although 540-nm red-free photography provided acceptable photographs, it did not provide optimal detail of inner or deep retinal abnormalities. Longer wavelengths, 585 and 610 nm, best disclosed the extent of deep retinal abnormalities, including the extent of confluent macular edema (pseudocysts) and retinal detachment that surrounded macular holes. The addition of short- and long-wave-length photography to traditional red-free photography may provide better localization, understanding, and documentation of the three-dimensional relationships in macular vitreoretinal interface disorders.