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 Table of Contents  
Year : 2020  |  Volume : 58  |  Issue : 4  |  Page : 316-317

Unilateral ophthalmomyiasis externa

1 Department of Cataract and Refractive Surgery, Ophthalmology and Strabismus, Mahathma Eye Hospital Private Limited, Trichy, Tamil Nadu, India
2 Department of Glaucoma and Research, Ophthalmology and Strabismus, Mahathma Eye Hospital Private Limited, Trichy, Tamil Nadu, India
3 Department of Paediatric Ophthalmology and Strabismus, Ophthalmology and Strabismus, Mahathma Eye Hospital Private Limited, Trichy, Tamil Nadu, India

Date of Submission05-Aug-2020
Date of Acceptance18-Aug-2020
Date of Web Publication16-Dec-2020

Correspondence Address:
Dr. Prasanna Venkatesh Ramesh
Mahathma Eye Hospital Private Limited, No.6, Seshapuram, Thennur, Trichy - 620 017, Tamil Nadu
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/tjosr.tjosr_104_20

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How to cite this article:
Ramesh SV, Ramesh PV, Rajasekaran R, Ramesh MK. Unilateral ophthalmomyiasis externa. TNOA J Ophthalmic Sci Res 2020;58:316-7

How to cite this URL:
Ramesh SV, Ramesh PV, Rajasekaran R, Ramesh MK. Unilateral ophthalmomyiasis externa. TNOA J Ophthalmic Sci Res [serial online] 2020 [cited 2023 Jan 29];58:316-7. Available from: https://www.tnoajosr.com/text.asp?2020/58/4/316/303666

A 20-year-old male presented with foreign body sensation and redness in his left eye. On eversion of the lid, conjunctival congestion and a motile, translucent worm were noted, which depicted photo-aversion. The worm were removed and sent for histopathology. The prominent features of the Oestrus ovis larva were observed [Figure 1] with a segmented translucent body; white cephalopharyngeal skeleton; and characteristic curved, dark oral hooklets. Conjunctival ophthalmomyiasis is commonly caused by O. ovis (sheep bot fly).[1],[2] Ophthalmomyiasis externa should be a differential diagnosis in the cases of unilateral conjunctivitis, especially in those living near a farm.[3]
Figure 1: (a and b) The translucent bot fly larva in low and high magnification, respectively. (c) Microscopic view of the Oestrus ovis larva with translucent segmented body with two oval hooks anteriorly

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Oestrus ovis belongs to the Class: Insecta, Order: Diptera and Family: Oestridae. It is the most common cause of human myiasis.[4]

The fly deposits hatched larvae, during flight on the moist surfaces such as nasal mucosa of sheep and cattle and accidentally human eyes. Man is an accidental host and hence the ocular myiasis in humans may be a rare condition. These larvae can penetrate intact skin and conjunctival mucus membrane, and manifest as ophthalmomyiasis.[5]

Ophthalmomyiasis can be classified into three types based on their location:[6] External Ophthalmomyiasis where larvae are present on the lids and ocular surface. It may present as conjunctivitis, preseptal cellulitis or keratouveitis. When there is penetration of larva into aqueous, iris, vitreous or sub retinal space it is called as internal ophthalmomyiasis. In orbital ophthalmomyiasis there is Involvement of ocular adnexa and optic nerve. It is the most destructive type.

It is known that internal ophthalmomyiasis and orbital ophthalmomyiasis are a sequelae of external disease, though it is very rare. But keeping in mind the possibility of such scenarios it is mandatory to do a thorough posterior segment evaluation during followup visits.[7]

Declaration of patient consent

The authors certify that they have obtained all appropriate patient consent forms. In the form, the legal guardian has given his consent for images and other clinical information to be reported in the journal. The guardian understands that names and initials will not be published and due efforts will be made to conceal identity, but anonymity cannot be guaranteed.

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Conflicts of interest

There are no conflicts of interest.

  References Top

Cameron JA, Shoukrey NM, al-Garni AA. Conjunctival ophthalmomyiasis caused by the sheep nasal botfly (Oestrus ovis). Am J Ophthalmol 1991;112:331-4.  Back to cited text no. 1
Choudhary P, Rathore MK, Dwivedi P, Lakhtakia S, Chalisgaonkar C, Dwivedi A. Red eye: Rule out ophthalmomyiasis too. Indian J Ophthalmol 2013;61:293-5.  Back to cited text no. 2
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Al-Amry M, Al-Saikhan FI, Al-Dahmash S. External ophthalmomyiasis: A case report. Saudi J Ophthalmol 2014;28:322-4.  Back to cited text no. 3
Dunbar J, Cooper B, Hodgetts T, Yskandar H, van Thiel P, Whelan S, et al. An outbreak of human external ophthalmomyiasis due to Oestrus ovis in southern Afghanistan. Clin Infect Dis 2008;46:e124–6.  Back to cited text no. 4
Beaver P.C., Jung R.C., Cupp E.W. 9th ed. Lea & Febiger; Philadelphia, USA: 1984. Clinical parasitology; pp. 680-95.  Back to cited text no. 5
Gregory AR, Schatz S, Laubach H. Ophthalmomyiasis caused by the sheep bot fly Oestrus ovis in northern Iraq. Optom Vis Sci 2004;81(8):586–90.  Back to cited text no. 6
Thakur K, Singh G, Chauhan S, Sood A. Vidi, vini, vinci: External ophthalmomyiasis infection that occurred, and was diagnosed and treated in a single day: A rare case report. Oman J Ophthalmol 2009 Sep;2(3):130-2.  Back to cited text no. 7


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