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608 AMERICAN JOURNAL OF OPHTHALMOLOGY APRIL, 1980 This unique observation has not re- ceived its due consideration in published reports on laser safety to date, even though it may have significant implica- tions upon the establishment of laser safety criteria for different races. Much research is required to clarify this issue further. JOSEPH MOISSEIEV, M. D. AND ELISHA BARTOV, M.D. Tel Aviv, Israel REFERENCES 1. Beatrice E. S., and Velez S.: Laser bioeffects research. Histopathology of retinal effects. SPIE vol. 162 Visual and Image Realism, 1978, pp 103-106. 2. Marshal J.: Thermal and mechanical mecha- nisms in laser damage to the retina. Invest. Ophthal- mol. 9:97, 1970. 3. Marshal J., Hamilton A. M., and Bird A. c Histopathology of ruby and argon laser lesions in monkey and human retina, a comparative study. Br. J. Ophthalmol. 59:610, 1975. 4. Wheeler C. B.: Calculation of retinal tempera- ture distribution resulting from laser irradiation of the eye: 1. Continuous lasers. Phys, Med. BioI. 21:616, 1976. 5. Lappin P. W.: Assessment of ocular damage thresholds for laser radiation. Am. J. Ophthalmol. 48:600, 1971. 6. Gerraets W. J., Williams R. C., Chan G., Ham W. T., Guerry D., and Schmidt F. H.: The relative absoption of thermal energy in retina and choroid., Invest. Ophthalmol. 1:340, 1962. Inexpensive Support for Anterior Segment Photography Editor: Photography of the anterior segment requires a sturdy and adjustable support for the patient's head and the camera, combined with a movable light source. To satisfy these requirements, I modified a Zeiss slit-lamp table so that it would securely support both a 35-mm camera and an electronic flash unit (Figure). The camera support, made from steel shelv- ing, holds the camera with a tripod screw 39 em above the table surface. The support was screwed to the Zeiss table 6 em from the rear edge to provide an Figure (Brown). Camera and flash mounted on Zeiss table. adequate focusing range with the lens used. The flexible neck from a gooseneck lamp was attached to the forehead sup- port of the slit-lamp table and the elec- tronic flash unit was attached to the free end of the flexible arm. Another tripod screw allowed movement through a 180- degree arc. This arrangement of camera and flash allows correct positioning of the light source and precise focusing of the camera by adjustment of the controls of the slit-lamp table. ALAN C. BROWN, M.D. New York, New York Three Cases of Dendritic Herpetic Ulcerations of the Conjunctiva Editor: The dendritic figure in the corneal epithelium is diagnostic of acute herpes simplex keratitis; however, the morpho- genesis of this branching lesion has not been clearly defined. 1 Dendritic ulcera- tions of the conjunctiva, On the other hand, have rarely been reported.! and we therefore describe three patients with

Inexpensive Support for Anterior Segment Photography

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608 AMERICAN JOURNAL OF OPHTHALMOLOGY APRIL, 1980

This unique observation has not re­ceived its due consideration in publishedreports on laser safety to date, eventhough it may have significant implica­tions upon the establishment of lasersafety criteria for different races. Muchresearch is required to clarify this issuefurther.

JOSEPH MOISSEIEV, M. D.

AND

ELISHA BARTOV, M.D.

Tel Aviv, Israel

REFERENCES

1. Beatrice E. S., and Velez S.: Laser bioeffectsresearch. Histopathology of retinal effects. SPIE vol.162 Visual and Image Realism, 1978, pp 103-106.

2. Marshal J.: Thermal and mechanical mecha­nisms in laser damage to the retina. Invest. Ophthal­mol. 9:97, 1970.

3. Marshal J., Hamilton A. M., and Bird A. cHistopathology of ruby and argon laser lesions inmonkey and human retina, a comparative study. Br.J. Ophthalmol. 59:610, 1975.

4. Wheeler C. B.: Calculation of retinal tempera­ture distribution resulting from laser irradiation ofthe eye: 1. Continuous lasers. Phys, Med. BioI.21:616, 1976.

5. Lappin P. W.: Assessment of ocular damagethresholds for laser radiation. Am. J. Ophthalmol.48:600, 1971.

6. Gerraets W. J., Williams R. C., Chan G., HamW. T., Guerry D., and Schmidt F. H.: The relativeabsoption of thermal energy in retina and choroid.,Invest. Ophthalmol. 1:340, 1962.

Inexpensive Support for AnteriorSegment Photography

Editor:Photography of the anterior segment

requires a sturdy and adjustable supportfor the patient's head and the camera,combined with a movable light source.To satisfy these requirements, I modifieda Zeiss slit-lamp table so that it wouldsecurely support both a 35-mm cameraand an electronic flash unit (Figure). Thecamera support, made from steel shelv­ing, holds the camera with a tripod screw39 em above the table surface. Thesupport was screwed to the Zeiss table6 em from the rear edge to provide an

Figure (Brown). Camera and flash mounted onZeiss table.

adequate focusing range with the lensused. The flexible neck from a goosenecklamp was attached to the forehead sup­port of the slit-lamp table and the elec­tronic flash unit was attached to the freeend of the flexible arm. Another tripodscrew allowed movement through a 180­degree arc. This arrangement of cameraand flash allows correct positioning of thelight source and precise focusing of thecamera by adjustment of the controls ofthe slit-lamp table.

ALAN C. BROWN, M.D.

New York, New York

Three Cases of Dendritic HerpeticUlcerations of the Conjunctiva

Editor:The dendritic figure in the corneal

epithelium is diagnostic of acute herpessimplex keratitis; however, the morpho­genesis of this branching lesion has notbeen clearly defined. 1 Dendritic ulcera­tions of the conjunctiva, On the otherhand, have rarely been reported.! andwe therefore describe three patients with