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Year : 1983  |  Volume : 31  |  Issue : 5  |  Page : 538-539

A clinical study of meridional ridges

Inst. of Ophthalmology, Aligarh Muslim University, Aligarh, India

Correspondence Address:
Manoj Shukla
Inst. of Ophthalmology, Aligarh Muslim University, Aligarh
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Source of Support: None, Conflict of Interest: None

PMID: 6671752

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How to cite this article:
Shukla M, Ahuja O P. A clinical study of meridional ridges. Indian J Ophthalmol 1983;31:538-9

How to cite this URL:
Shukla M, Ahuja O P. A clinical study of meridional ridges. Indian J Ophthalmol [serial online] 1983 [cited 2020 Feb 21];31:538-9. Available from: http://www.ijo.in/text.asp?1983/31/5/538/36580

Periphery of retina is a site of predilection for certain interesting developmental variations and pathological lesions. These however, have received comparatively lesser attention in our part of the world [1] . The present investigation has been undertaken to study one of the most important developmental variation of peripheral retina-the meridional ridges in apparently normal Indian population and to find out their association if any, with retinal breaks.

  Material and Methods Top

The present study was undertaken on 1000 eyes of 500 individuals who were picked up randomly from the refraction units of institute of Ophthalmology and Gandhi Eye Hospital, Aligarh. Majority of these subjects did not have any symptoms related to a retinal disease and belonged to all age groups, both sexes and of different refractive errors. Six subjects however, had mild symptoms of flashes of light in one eye which did not interfere with their routine work and as such were overlooked. Visual acuity and refractive status of each individual was recorded and a general screening of anterior segment was done. The examination of peri­pheral retina was undertaken after a maximal pupillary dilatation with the help of Fison's indentation indirect Ophthalmoscope which was further supplemented by posterior segment biomicroscopy with the help of Goldmann's 3-mirror contact lens in eyes with meridional ridges. The findings were recorded on a conventional fundus chart.

  Observations Top

Meridional ridges were seen in 204 (20.4%) eyes of 124 (24.8%) subjects being bilateral in 80 (80.52%). They appeared more or less uniformly in all the age groups without predilection to any sex or state of refractions.

  Clinical Types of Meridional ridges Top

Two types of meridional ridges were observed in the present study. The more common ones were larger in size having a broad posterior extremity and aligned with large dentate processes. This variety of meridional ridge was seen in 176 (86.27%) eyes. The second type of meridional ridges were comparatively shorter with a broad anterior extremity. They were seen in 20 (9.80%) eyes being aligned commonly with deep ora bays. In 8 (3.93%) eyes, both types of meriodinal ridges were observed. The number of ridges in affected eyes varied from one to six.

A total number of 380 meridional ridges were observed, out of which a great majority (304; 80%) were located in the supero-nasal quadrant. Followed by infero-nasal (10.5%) supero-temporal (5.5%) and infero temporal (4%).

All the meridional ridges observed in this study were associated with mild to moderate cystoid degenera­tion. No any other trophic or tractional peripheral retinal degeneration was observed in the vicinity of these ridges.

In all instances, the vitreous overlying these ridges was clear and did not reveal any clinically demonstrable abnormality in the form of liquifaction, traction or posterinr vitreous detachment.

Retinal breaks in the form of partial thickness round holes were seen in 20 (9.80%) eyes in relation with meridional ridges. In 6 (2.94%) eyes, these holes were responsible for symptoms of photopsia. Character­istically these holes were present suborally at the posterior extremity of larger type of meridional ridges. A total number of 26 round holes were seen and interestingly out of these 18 (69.23%) were located in the temporal quadrants. No frank retinal tear or retinal detachment was observed in relation in meridional ridges in the present study.

  Discussion Top

A clinical study of developmental meridional ridges of peripheral retina was undertaken in 1000 eyes of `00 Indian subjects who were picked up randomly from general population. Two types of meridional ridges were observed being present in 20.4% of eyes examined with a predilection for oral region in the supero-nasal quadrant. No association of these ridges with any age, sex or refractive error was observed. Retinal breaks in the form of partial thickness round holes were seen in 20 (9.80%) eyes being commonly located at the posterior extremity of larger variety of meridional ridges in the temporal periphery. In 6 (2.94%) eyes these holes were responsible for subjective symptoms of photopsia.

It is suggested that although innocent looking, meridional ridges should be periodi­cally observed in view of their not unfrequent association with round holes. Such holes may be prophylactically treated on their merit.

  References Top

Shukla, M., and Ahuja, O.P., Ind. J. Ophthal., 28: 189, 1981.  Back to cited text no. 1


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